@article{10_14708_ma_v23i37_1826,
     author = {Jacek Ma\'nko},
     title = {Bifuzzy sets and other generalizations of a fuzzy set},
     journal = {Mathematica Applicanda},
     pages = { 39--47},
     publisher = {mathdoc},
     volume = {23},
     number = {37},
     year = {1994},
     doi = {10.14708/ma.v23i37.1826},
     language = {pl},
     url = {http://geodesic.mathdoc.fr/articles/10.14708/ma.v23i37.1826/}
}