@article{10_14708_ma_v8i16_1467,
     author = {Stanis{\l}aw Heilpern},
     title = {Selected problems in the theory of fuzzy sets},
     journal = {Mathematica Applicanda},
     pages = { 27--38},
     publisher = {mathdoc},
     volume = {8},
     number = {16},
     year = {1980},
     doi = {10.14708/ma.v8i16.1467},
     language = {pl},
     url = {http://geodesic.mathdoc.fr/articles/10.14708/ma.v8i16.1467/}
}