TY  - JOUR
AU  - Nieminen, Juhani
TI  - On the algebraic structure of fuzzy sets of type 2
JO  - Kybernetika
PY  - 1977
SP  - 261
EP  - 273
VL  - 13
IS  - 4
UR  - http://geodesic.mathdoc.fr/item/KYB_1977_13_4_a2/
LA  - en
ID  - KYB_1977_13_4_a2
ER  -