Narlikar, J. V.Subramanian, KandaswamyNarasimha, D.et al.2012-03-242012-03-241983-01-14http://hdl.handle.net/11007/1592Astronomical modelsGravitational lensesQuasarsextragalactic radio sourcesRed shiftRelativistic velocityQuasars Q 2345 + 007 A,B and 3C 273 : Gravitational Lenses?