@article{PIM_1980_N_S_27_41_a12,
     author = {M. Heged\"us},
     title = {Some {Extensions} {Of} {Fixed} {Point} {Theorems} {Concerning} {\'Ciri\'c's} {Quasi-Contraction} {Mappings}},
     journal = {Publications de l'Institut Math\'ematique},
     pages = {77 },
     publisher = {mathdoc},
     volume = {_N_S_27},
     number = {41},
     year = {1980},
     url = {http://geodesic.mathdoc.fr/item/PIM_1980_N_S_27_41_a12/}
}