@article{NSJOM_1984__14__a32,
     author = {\v{S}e\v{s}elja Branimir and Vojvodi\'c Gradimir},
     title = {Fuzzy sets on {S} as closure operations on {P(S)}},
     journal = {Novi Sad Journal of Mathematics},
     pages = {117-127},
     publisher = {mathdoc},
     volume = {14},
     year = {1984},
     url = {http://geodesic.mathdoc.fr/item/NSJOM_1984__14__a32/}
}