TY  - BOOK
AU  - Kaufmann Arnold
AU  - Swanson D L
TI  - Introduction to the theory of fuzzy subsets: Fundamental theoretical elements
SN  - 0-12-402301-0
U1  - 511.32 
PY  - 1975///
CY  - New York
PB  - Academic Press
KW  - Mathematical logic
KW  - Set theory
ER  -