Richard Bellman, Magnus Giertz. On the Analytic Formalism of the Theory of Fuzzy Sets. Inf. Sci., 5:149-156, 1973. [doi]
@article{Bellman73,
title = {On the Analytic Formalism of the Theory of Fuzzy Sets},
author = {Richard Bellman and Magnus Giertz},
year = {1973},
doi = {10.1016/0020-0255(73)90009-1},
url = {http://dx.doi.org/10.1016/0020-0255(73)90009-1},
researchr = {https://researchr.org/publication/Bellman73},
cites = {0},
citedby = {0},
journal = {Inf. Sci.},
volume = {5},
pages = {149-156},
}