, When multiple images of the same background source are formed, the event is known as strong gravitational lensing

P. J. Marshall, Astrophys. J, vol.671, p.1196, 2007.

D. P. Stark, Nature, vol.455, p.775, 2008.

A. M. Swinbank, Nature, vol.464, p.733, 2010.

I. Smail, R. J. Ivison, and A. W. Blain, Astrophys. J. L, vol.490, p.5, 1997.

A. W. Blain, J. Kneib, R. J. Ivison, and I. Smail, Astrophys. J. L, vol.512, p.87, 1999.

M. Rowan-robinson, Nature, vol.351, p.719, 1991.

I. Smail, R. J. Ivison, A. W. Blain, and J. Kneib, Mon. Not. R. Astron. Soc, vol.331, p.495, 2002.

J. D. Vieira, Astrophys. J, vol.719, p.763, 2010.

G. L. Pilbratt, Astron. & Astrophys, vol.518, p.1, 2010.

A. W. Blain, Mon. Not. R. Astron. Soc, vol.283, p.1340, 1996.

F. Perrotta, C. Baccigalupi, M. Bartelmann, G. De-zotti, and G. L. Granato, Mon. Not. R. Astron. Soc, vol.329, p.445, 2002.

F. Perrotta, Mon. Not. R. Astron. Soc, vol.338, p.623, 2003.

M. Negrello, Mon. Not. R. Astron. Soc, vol.377, p.1557, 2007.

K. Coppin, Mon. Not. R. Astron. Soc, vol.372, p.1621, 2006.

S. C. Chapman, A. W. Blain, I. Smail, and R. J. Ivison, Astrophys. J, vol.622, p.772, 2005.

S. Serjeant and D. Harrison, Mon. Not. R. Astron. Soc, vol.356, p.192, 2005.

G. De-zotti, Astron. & Astrophys, vol.431, p.893, 2005.

L. V. Koopmans, T. Treu, A. S. Bolton, S. Burles, and L. A. Moustakas, Astrophys. J, vol.649, p.599, 2006.

I. W. Browne, The Class Collaboration, of Astronomical Society of the Pacific Conference Series, vol.237, p.15, 2001.

M. Oguri, Astron. J, vol.132, p.999, 2006.

C. Faure, Astrophys. J. S, vol.176, p.19, 2008.

A. Weiß, Astrophys. J, vol.707, p.1201, 2009.

M. J. Devlin, Nature, vol.458, p.737, 2009.

S. Eales, Publ. Astron. Soc. Pac, vol.122, p.499, 2010.

M. J. Griffin, Astron. & Astrophys, vol.518, p.3, 2010.

E. Pascale,

A. Poglitsch, Astron. & Astrophys, vol.518, p.2, 2010.

E. Ibar,

S. Driver,

E. E. Rigby,

D. L. Clements, Astron. & Astrophys, vol.518, p.8, 2010.

M. Baes, Astron. & Astrophys, vol.518, p.39, 2010.

J. González-nuevo, Astron. & Astrophys, vol.518, p.38, 2010.

, Supporting online material (SOM)

D. J. Smith,

D. H. Hughes, Mon. Not. R. Astron. Soc, vol.335, p.871, 2002.

I. Aretxaga, Mon. Not. R. Astron. Soc, vol.342, p.759, 2003.

A. Weiß, Astrophys. J. L, vol.705, p.45, 2009.

E. Daddi, Astrophys. J. L, vol.695, p.176, 2009.

N. 1. References and . Oke, Publ. Astron. Soc. Pac, vol.107, p.375, 1995.

J. K. Mccarthy, Society of Photo-Optical Instrumentation Engineers (SPIE) Conference, vol.3355, pp.81-92, 1998.

S. Guilloteau, Astron. & Astrophys, vol.262, p.624, 1992.

C. Y. Peng, L. C. Ho, C. D. Impey, and H. Rix, Astron. J, vol.124, p.266, 2002.

J. J. Condon, Publ. Astron. Soc. Pac, vol.109, p.166, 1997.

R. J. Ivison, Mon. Not. R. Astron. Soc, vol.380, p.199, 2007.

R. Kormann, P. Schneider, and M. Bartelmann, Astron. & Astrophys, vol.284, p.285, 1994.

C. R. Keeton, , 2001.

A. M. Swinbank, Nature, vol.464, p.733, 2010.

D. Hill,