@article{KYB_1992__28_Suppl_a2,
     author = {Ostasiewicz, Walenty},
     title = {Half a century of fuzzy sets},
     journal = {Kybernetika},
     pages = {17--20},
     publisher = {mathdoc},
     volume = {28},
     number = {Suppl},
     year = {1992},
     mrnumber = {1226044},
     zbl = {0875.04001},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/KYB_1992__28_Suppl_a2/}
}