@article{MV_1972_24_1_a37,
     author = {Lj. B. \'Ciri\'c},
     title = {Fixed points for generalized multi-valued contractions},
     journal = {Matemati\v{c}ki vesnik},
     pages = {265 },
     year = {1972},
     volume = {24},
     number = {1},
     url = {http://geodesic.mathdoc.fr/item/MV_1972_24_1_a37/}
}