@article{NSJOM_1991_21_1a_14,
     author = {Fisher Brian},
     title = {Common fixed points of 

 commuting set-valued mappings},
     journal = {Novi Sad Journal of Mathematics},
     pages = {147-156},
     publisher = {mathdoc},
     volume = {21},
     number = {1},
     year = {1991},
     url = {http://geodesic.mathdoc.fr/item/NSJOM_1991_21_1a_14/}
}