0 citations0 referencesGoogle Scholardoi.orgThe principle of reciprocityInternational Journal of Theoretical Physics·1972·Vol. 6(5), pp. 383–397Citations Over TimeIrshadullah KhanRelated Papers→ A slitless spectroscopic survey for quasars near quasars(2008)6 cited→ Infrared observations of the X-ray quasars 0241 + 622 and MR2251–178(1979)3 cited→ WFPC2 Imaging of Quasar Environments: A Comparison of LBQS and HST Archive Quasars(2001)→ Quasars and Active Galactic Nuclei(2002)