Geodesic
On Common Fixed Point Theorem of Four Mappings
Bulletin of the Malaysian Mathematical Society, Tome 25 (2002) no. 1 
Sushil Sharma; P.C. Patidar. On Common Fixed Point Theorem of
                        Four Mappings. Bulletin of the Malaysian Mathematical Society, Tome 25 (2002) no. 1. http://geodesic.mathdoc.fr/item/BMMS_2002_25_1_a2/
@article{BMMS_2002_25_1_a2,
     author = {Sushil Sharma and P.C. Patidar},
     title = {On {Common} {Fixed} {Point} {Theorem} of
                        {Four} {Mappings}},
     journal = {Bulletin of the Malaysian Mathematical Society},
     year = {2002},
     volume = {25},
     number = {1},
     url = {http://geodesic.mathdoc.fr/item/BMMS_2002_25_1_a2/}
}
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Voir la notice de l'article provenant de la source BMMS

In this paper we shall prove common fixed point theorems for four mappings in complete metric space. Our theorems generalize results of Banach [1], Kannan [5], Fisher [4] and Chatterjee [2].