[1] Abdelkrim Aliouche and Brian Fisher, A related fixed point theorem
for two pairs of mappings on two complete metric spaces, Hacettepe J.
Math. Statist. 34 (2005), 39-45.
[2] Abdelkrim Aliouche and Brian Fisher, Fixed point theorems on three
complete and compact metric spaces, Universitatea Din Bacau, Studii Si
Cercetari Stiintfice, Seria: Matematica, Nr. 17 (2007), 13-20.
[3] B. Fisher, Fixed point on two metric spaces, Glasnik Mat. 16(36)
(1981), 333-337.
[4] B. Fisher and P. P. Murphy, Related fixed points theorems for two
pairs of mappings on two metric spaces, Kyungpook Math. J. 37 (1997),
343-347.
[5] B. Fisher and D. Turkoglu, Related fixed points for set valued
mappings on two metric spaces, Int. J. Math. Math. Sci. 23(3) (2000),
205-210.
[6] T. L. Hicks and B. E. Rhoades, Fixed points theory in symmetric
spaces with applications to probabilistic spaces, Nonlinear Analysis
36 (1999), 331-344.
[7] R. K. Namdeo and B. Fisher, A related fixed point theorem for two
pairs of mappings on two metric spaces, Nonlinear Analysis Forum 8(1)
(2003), 23-27.
[8] V. Popa, A general fixed point theorem for two pairs of mappings
on two metric spaces, Novi Sad J. Math. 35(2) (2005), 79-83.
[9] M. Telci, Fixed points on two complete and compact metric spaces,
Applied Mathematics and Mechanics (English Edition) 22(5) May
(2001).
[10] W. A. Wilson, On semi metric spaces, Amer. J. Math. 53 (1931),
361-373.