TY - JOUR AU - Spal, Jindřich TI - Fundamentals of a mathematical theory of fuzzy sets JO - Applications of Mathematics PY - 1982 SP - 326 EP - 340 VL - 27 IS - 5 PB - mathdoc UR - http://geodesic.mathdoc.fr/articles/10.21136/AM.1982.103980/ DO - 10.21136/AM.1982.103980 LA - en ID - 10_21136_AM_1982_103980 ER -