TY - JOUR AU - Havrda, Jan AU - Charvát, František TI - Quantification method of classification processes. Concept of structural $a$-entropy JO - Kybernetika PY - 1967 SP - EP - 35 VL - 03 IS - 1 PB - mathdoc UR - http://geodesic.mathdoc.fr/item/KYB_1967__3_1_a2/ LA - en ID - KYB_1967__3_1_a2 ER -