@article{NSJOM_1980_10_Nonea_1,
     author = {Had\v{z}i\'c Olga},
     title = {A generalization of the 

 contraction principle in probabilistic metric spaces},
     journal = {Novi Sad Journal of Mathematics},
     pages = {13-20},
     publisher = {mathdoc},
     volume = {10},
     year = {1980},
     url = {http://geodesic.mathdoc.fr/item/NSJOM_1980_10_Nonea_1/}
}