@article{PIM_1982_N_S_32_46_a23,
     author = {Salvatore Sessa},
     title = {On {A} {Weak} {Commutativity} {Condition} {Of} {Mappings} {In} {Fixed} {Point} {Considerations}},
     journal = {Publications de l'Institut Math\'ematique},
     pages = {149 },
     publisher = {mathdoc},
     volume = {_N_S_32},
     number = {46},
     year = {1982},
     url = {http://geodesic.mathdoc.fr/item/PIM_1982_N_S_32_46_a23/}
}