In the paper titled “Null Geodesics and Strong Field Gravitational Lensing in a String Cloud Background,” recently, we have studied null geodesics and strong field gravitational lensing of a black hole with string cloud background [1]. References of some equations were missing in the paper titled “Null Geodesics and Strong Field Gravitational Lensing in a String Cloud Background.” Here we add these references. Equations (10), (13), and (22) were originally derived in the following references:
Claudel, C. M., Virbhadra, K. S. and Ellis, G. F. R.: J. Math. Phys. 42(2001)818.
Virbhadra, K. S., Narasimha, D. and Chitre, S. M.: Astron. Astrophys. 337(1998)1.
Virbhadra, K. S. and Ellis, G. F. R.: Phys. Rev. D 65(2002)103004.
SharifM.IftikharS.Null geodesics and strong field gravitational lensing in a string cloud background20152015963562510.1155/2015/635625MR3368829