@article{NSJOM_1982_12_Nonea_1,
     author = {Had\v{z}i\'c Olga},
     title = {On common fixed point theorems 

 in 2-metric spaces},
     journal = {Novi Sad Journal of Mathematics},
     pages = {7-18},
     publisher = {mathdoc},
     volume = {12},
     year = {1982},
     url = {http://geodesic.mathdoc.fr/item/NSJOM_1982_12_Nonea_1/}
}