@article{NSJOM_1986_16_1a_3,
     author = {Fisher 

 Brian and Sessa Salvatore},
     title = {Common fixed points of two 

 pairs of weakly commuting mappings},
     journal = {Novi Sad Journal of Mathematics},
     pages = {45-59},
     publisher = {mathdoc},
     volume = {16},
     number = {1},
     year = {1986},
     url = {http://geodesic.mathdoc.fr/item/NSJOM_1986_16_1a_3/}
}