TY  - BOOK
AU  - Kaufmann, A.
AU  - Swanson, D. L.
TI  - Introduction to the theory of fuzzy subsets
U1  - 511.3 
PY  - 1975///
CY  - New York
PB  - Academic Press
N1  - "Translated by D. L. Swanson"
ER  -