@article{KYB_1977__13_4_a2,
     author = {Nieminen, Juhani},
     title = {On the algebraic structure of fuzzy sets of type 2},
     journal = {Kybernetika},
     pages = {--273},
     publisher = {mathdoc},
     volume = {13},
     number = {4},
     year = {1977},
     mrnumber = {0460195},
     zbl = {0366.94003},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/KYB_1977__13_4_a2/}
}