Paul Axt
Douglas Clarke
Robert Constable
David Kierstead
Shih-Chao Liu
Joan Moschovakis
Yiannis Moschovakis
Nels David Nelson
Gene Rose
Clifford Spector
Richard Vesley
Dick de Jongh
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Those most popular in the literature are three-valued (e.g., Łukasiewicz's and Kleene's, which accept the values "true", "false", and "unknown"), the finite-valued with more than three values, and the infinite-valued, such as fuzzy logic and probability logic.