@article{NSJOM_1986_16_2a_8,
     author = {Fisher Brian and Sessa Salvatore},
     title = {A pair of commuting mappings with a 

 common fixed point},
     journal = {Novi Sad Journal of Mathematics},
     pages = {89-99},
     publisher = {mathdoc},
     volume = {16},
     number = {2},
     year = {1986},
     url = {http://geodesic.mathdoc.fr/item/NSJOM_1986_16_2a_8/}
}