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| 2000A&A...360...10R | Refsdal, S.; Stabell, R.; Pelt, J.; Schild, R. | Constraints on source and lens parameters from microlensing variability in QSO 0957+561 A,B |
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| 1999ApJ...524..582C | Chae, Kyu-Hyun | New Modeling of the Lensing Galaxy and Cluster of Q0957+561: Implications for the Global Value of the Hubble Constant |
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| 1999ApJ...514..598S | Schild, R. | A Wavelet Exploration of the Q0957+561A,B Brightness Record |
| 1999ApJ...510...64H | Haarsma, D. B.; Hewitt, J. N.; Lehar, J.; Burke, B. F. | The Radio Wavelength Time Delay of Gravitational Lens 0957+561 |
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| 1999AJ....118...14B | Bernstein, Gary; Fischer, Philippe | Values of H_0 from Models of the Gravitational Lens 0957+561 |
| 1998NewAR..42..101W | Wambsganss, J.; Schmidt, R. | Microlensing constraints on MACHO masses from the double quasar Q0957+561. |
| 1998ApJ...507..108P | Press, William H.; Rybicki, George B. | Magnification Ratio of the Fluctuating Light in Gravitational Lens 0957+561 |
| 1998ApJ...504..661C | Chartas, G.; Chuss, D.; Forman, W.; Jones, C.; Shapiro, I. | X-Ray Detection of the Primary Lens Galaxy Cluster of the Gravitational Lens System Q0957+561 |
| 1998Ap&SS.259..295O | Oknyanskij, V. L. | Variable Radio Echoes from a Jet in QSO 0957 + 561. II. Statistical Significance of the Result |
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| 1997ApJ...483L..79B | Bernstein, Gary; Fischer, Philippe; Tyson, J. Anthony; Rhee, George | Improved Parameters and New Lensed Features for Q0957+561 from WFPC2 Imaging |
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| 1997ApJ...479..102H | Haarsma, D. B.; Hewitt, J. N.; Lehar, J.; Burke, B. F. | The 6 Centimeter Light Curves of B0957+561, 1979--1994: New Features and Implications for the Time Delay |
| 1997ApJ...477..568Z | Zuo, Lin; Beaver, E. A.; Burbidge, E. Margaret; Cohen, Ross D.; Junkkarinen, Vesa T.; Lyons, R. W. | The Dust-to-Gas Ratio in the Damped Ly alpha Clouds toward the Gravitationally Lensed QSO 0957+561 |
| 1997ApJ...474..598M | Michalitsianos, A. G.; Dolan, J. F.; Kazanas, D.; Bruhweiler, F. C.; Boyd, P. T.; Hill, R. J.; Nelson, M. J.; Percival, J. W.; Van Citters, G. W. | Ly alpha Absorption-Line Systems in the Gravitational Lens Q0957+561 |
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| 1997Ap&SS.246..299O | Oknyanskij, V. L. | Variable radio echoes from a jet in QSO 0957+561. |
| 1997AJ....114.2240H | Harvanek, Michael; Stocke, John T.; Morse, Jon A.; Rhee, George | High Dynamic Range VLA Observations of the Gravitationally Lensed Quasar 0957+561 |
| 1997AJ....113..521F | Fischer, Philippe; Bernstein, Gary; Rhee, George; Tyson, J. Anthony | The Mass Distribution of the Cluster 0957+561 From Gravitational Lensing |
| 1997AJ....113..130S | Schild, Rudy; Thomson, David J. | The Q0957+561 Time Delay From Optical Data |
| 1996ApJ...473..570G | Grogin, Norman A.; Narayan, Ramesh | A New Model of the Gravitational Lens 0957+561 and a Limit on the Hubble Constant: Erratum |
| 1996ApJ...470L..19O | Oscoz, Alejandro; Serra-Ricart, Miquel; Goicoechea, Luis Julian; Buitrago, Jesus; Mediavilla, Evencio | Optical Photometry of Quasar 0957+561A, B |
| 1996ApJ...464..125S | Schild, Rudolph E. | Microlensing Variability of the Gravitationally Lensed Quasar Q0957+561 A,B |
| 1996ApJ...464...92G | Grogin, Norman A.; Narayan, Ramesh | A New Model of the Gravitational Lens 0957+561 and a Limit on the Hubble Constant |
| 1996A&A...305...97P | Pelt, J.; Kayser, R.; Refsdal, S.; Schramm, T. | The light curve and the time delay of QSO 0957+561. |
| 1996A&A...305...97P | Pelt, J.; Kayser, R.; Refsdal, S.; Schramm, T. | The light curve and the time delay of QSO 0957+561. |
| 1995ApJ...455L...5K | Kundic, Tomislav; Colley, Wesley N.; Gott, J. Richard, III; Malhotra, Sangeeta; Pen, Ue-Li; Rhoads, James E.; Stanek, Krzysztof Z.; Turner, Edwin L.; Wambsganss, Joachim | An Event in the Light Curve of 0957+561A and Prediction of the 1996 Image B Light Curve |
| 1995ApJ...445..140C | Chartas, G.; Falco, E.; Forman, W.; Jones, C.; Schild, R.; Shapiro, I. | ROSAT observations of the gravitationally lensed system 0957+561 |
| 1995ApJ...442...87D | Dolan, J. F.; Michalitsianos, A. G.; Thompson, R. W.; Boyd, P. T.; Wolinski, K. G.; Bless, R. C.; Nelson, M. J.; Percival, J. W.; Taylor, M. J.; Elliot, J. L.; Van Citters, G. W. | The gravitational lens system Q0957+561 in the ultraviolet |
| 1995AJ....110.2566C | Campbell, R. M.; Lehar, J.; Corey, B. E.; Shapiro, I. I.; Falco, E. E. | VLBI Observations of the Gravitational Lens System 0957+561 |
| 1995AJ....109.1970S | Schild, Rudy; Thomson, David J. | Twin QSO Q0957+561 Time Delay Dataset |
| 1995A&A...304..341B | Beskin, G. M.; Oknyanskij, V. L. | The optical time delay in the double quasar Q 0957+561 A, B. |
| 1995A&A...304..341B | Beskin, G. M.; Oknyanskij, V. L. | The optical time delay in the double quasar Q 0957+561 A, B. |
| 1994MNRAS.270..457G | GARRETT M.A., CALDER R.J., PORCAS R.W., KING L.J., WALSH D. and WILKINSON P.N. | Global VLBI observations of the gravitational lens system 0957+561 A,B. |
| 1994ApJ...435L..79D | Dahle, H.; Maddox, S. J.; Lilje, Per B. | Deep imaging of the double quasar QSO 0957+561: New constraints on H(sub 0) |
| 1994ApJ...426..486C | Campbell, R. M.; Corey, B. E.; Falco, E. E.; Shapiro, I. I.; Gorenstein, M. V.; Elosegui, P.; Marcaide, J. M.; Alvi, K. | Toward estimation of H(sub 0) from VLBI observations of the gravitational lens system 0957+561 |
| 1994A&A...291..411A | Angonin-Willaime, M.-C.; Soucail, G.; Vanderriest, C. | Gravitational lensing of Q 0957+561: A study of the cluster at Z = 0.355 |
| 1994A&A...286..775P | Pelt, J.; Hoff, W.; Kayser, R.; Refsdal, S.; Schramm, T. | Time delay controversy on QSO 0957+561 not yet decided |
| 1994A&A...291..411A | Angonin-Willaime, M. -C.; Soucail, G.; Vanderriest, C. | Gravitational lensing of Q 0957+561: A study of the cluster at z = 0.355 |
| 1994A&A...286..775P | Pelt, J.; Hoff, W.; Kayser, R.; Refsdal, S.; Schramm, T. | Time delay controversy on QSO 0957+561 not yet decided |
| 1993BAAS...25.1307M | MICHALITSIANOS A.G.; MARAN S.P.; KAZANAS D. and al. | Analysis of far-UV excitation line emission detected in the gravitational lens Q0957+561 with IUE-NEWSIPS. |
| 1993ApJ...410...21J | Jones, C.; Stern, C.; Falco, E.; Forman, W.; David, L.; Shapiro, I.; Fabian, A. C. | Discovery of a new component in the gravitationally lensed quasar 0957 + 561 |
| 1993ApJ...407...60T | Turnshek, David A.; Bohlin, Ralph C. | Damped Lyman-alpha absorption in Q0957+561A, B |
| 1993AJ....105..816B | Bernstein, G. M.; Tyson, J. A.; Kochanek, C. S. | A large arc in the gravitational lens system 0957 + 561 |
| 1992MNRAS.254P..27G | Garrett, M. A.; Walsh, D.; Carswell, R. F. | Redshift measurements of the brightest cluster galaxies of the gravitational lens 0957 + 561 |
| 1992ApJ...387L..61C | Conner, Samuel R.; Lehar, Joseph; Burke, Bernard F. | Reconciling the image brightness ratios in the gravitational lens system 0957 + 561 |
| 1992ApJ...385..416P | Press, William H.; Rybicki, George B.; Hewitt, Jacqueline N. | The Time Delay of Gravitational Lens 0957+561. II. Analysis of Radio Data and Combined Optical-Radio Analysis |
| 1992ApJ...385..404P | Press, William H.; Rybicki, George B.; Hewitt, Jacqueline N. | The time delay of gravitational lens 0957 + 561. I - Methodology and analysis of optical photometric data. II - Analysis of radio data and combined optical-radio analysis |
| 1992ApJ...384..453L | Lehar, J.; Hewitt, J. N.; Burke, B. F.; Roberts, D. H. | The radio time delay in the double quasar 0957 + 561 |
| 1992A&A...255L..20H | Hjorth, P. G.; Villemoes, L. F.; Teuber, J.; Florentin-Nielsen, R. | Wavelet analysis of 'double quasar' flux data |
| 1991Natur.350..211R | Rhee, George | An estimate of the Hubble constant from the gravitational lensing of quasar Q0957 + 561 |
| 1991MNRAS.251..698F | Falco, E. E.; Wambsganss, J.; Schneider, P. | The role of microlensing in estimates of the relative time delay for the gravitational images of Q0957 + 561 |
| 1991ApJ...372..364F | Falco, E. E.; Gorenstein, M. V.; Shapiro, I. I. | New model for the 0957 + 561 gravitational lens system - Bounds on masses of a possible black hole and dark matter and prospects for estimation of H0 |
| 1991AJ....101..813S | Schild, Rudolph E.; Smith, R. Chris | Microlensing in the Q0957 + 561 gravitational mirage |
| 1990AJ....100.1771S | Schild, Rudolph E. | The time delay in the twin QSO Q0957 + 561 |
| 1990A&A...232...16G | Gallais, P.; Rouan, D.; Lacombe, F.; Tiphene, D. | Direct 2.2 micron image of the gravitationally lensed quasar Q 0957+561 |
| 1990A&A...232...16G | Gallais, P.; Rouan, D.; Lacombe, F.; Tiphene, D. | Direct 2.2 micron image of the gravitationally lensed quasar Q 0957+561 |
| 1989A&A...215....1V | Vanderriest, C.; Schneider, J.; Herpe, G.; Chevreton, M.; Moles, M.; Wlerick, G. | The value of the time delay Delta t(A, B) for the 'double' quasar 0957+561 from optical photometric monitoring |
| 1989A&A...215....1V | Vanderriest, C.; Schneider, J.; Herpe, G.; Chevreton, M.; Moles, M.; Wlerick, G. | The value of the time delay Delta t(A, B) for the 'double' quasar 0957+561 from optical photometric monitoring |
| 1988ApJ...334...42G | Gorenstein, M. V.; Cohen, N. L.; Shapiro, I. I.; Rogers, A. E. E.; Bonometti, R. J.; Falco, E. E.; Bartel, N.; Marcaide, J. M. | VLBI observations of the gravitational lens system 0957+561 - Structure and relative magnification of the A and B images |
| 1986ApL....25...99Z | Zheng, W.; Hubbard, Eugene N. | An edge-on galaxy model for Q 0957 + 561 |
| 1986ApJ...300..209S | Schild, R. E.; Cholfin, B. | CCD camera brightness monitoring of Q0957 + 561 A, B |
| 1985Natur.314..402G | Gaskell, C. M. | DIRECT ESTIMATE OF HUBBLE'S CONSTANT FROM THE DOUBLE QUASAR |
| 1985ApJ...293..370G | Greenfield, P. D.; Roberts, D. H.; Burke, B. F. | The gravitationally lensed quasar 0957 + 561 - VLA observations and mass models |
| 1985ApJ...293..356R | Roberts, D. H.; Greenfield, P. E.; Hewitt, J. N.; Burke, B. F.; Dupree, A. K. | The multiple images of the quasar 0957 + 561 |
| 1985ApJ...289L...1F | Falco, E. E.; Gorenstein, M. V.; Shapiro, I. I. | On model-dependent bounds on H(0) from gravitational images Application of Q0957 + 561A,B |
| 1984MNRAS.210...79N | Narasimha, D.; Subramanian, K.; Chitre, S. M. | Gravitational lens model of the double QSO 0957 + 561 A,B incorporating VLBI features |
| 1984ApJ...287..538G | GORENSTEIN M.V., SHAPIRO I.I., ROGERS A.E.E., COHEN N.L., COREY B.E., PORCAS R.W., FALCO E.E., BONOMETTI R.J., PRESTON R.A., RIUS A. and WHITNEY A.R. | The milli-arcsecond images of Q0957+56.1. |
| 1984A&A...141..318B | Borgeest, U.; Refsdal, S. | The Hubble parameter - an upper limit from QSO 0957 + 561 A, B |
| 1984A&A...138L..19F | Florentin-Nielsen, R. | Determination of difference in light travel time for QSO 0957 + 561A, B |
| 1984A&A...141..318B | Borgeest, U.; Refsdal, S. | The Hubble parameter - An upper limit from QSO 0957 + 561 A, B |
| 1984A&A...138L..19F | Florentin-Nielsen, R. | Determination of difference in light travel time for QSO 0957 + 561A, B |
| 1983Sci...219...54G | GORENSTEIN M.V., SHAPIRO I.I., COHEN N.L., COREY B.E., ROGERS A.E.E., WHITNEY A.R., PORCAS R.W., PRESTON R.A. and RIUS A. | Detection of compact radio source near the center of gravitational lens : quasar image or galactic core ? |
| 1982ApJ...255...20K | Keel, W. C. | The nature of the light variations in the double QSO Q0957+561 |
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| 1981ApJ...249..415Y | Young, P.; Sargent, W. L. W.; Oke, J. B.; Boksenberg, A. | The origin of a new absorption system discovered in both components of the double QSO Q0957+561 |
| 1981ApJ...244..756Y | Young, P. | Q0957+561 - Effects of random stars on the gravitational lens |
| 1981ApJ...244..736Y | Young, P.; Gunn, J. E.; Oke, J. B.; Westphal, J. A.; Kristian, J. | Q0957+561 - Detailed models of the gravitational lens effect |
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