@article{NSJOM_1990_20_2a_18,
     author = {Had\v{z}i\'c Olga,},
     title = {On multivalued 

 contractions in probabilistic metric spaces},
     journal = {Novi Sad Journal of Mathematics},
     pages = {161-171},
     publisher = {mathdoc},
     volume = {20},
     number = {2},
     year = {1990},
     url = {http://geodesic.mathdoc.fr/item/NSJOM_1990_20_2a_18/}
}