Paul Jacoby   (°1915, †1993)

Jacoby, Paul. 1960. “Contrariety and the Triangle of Opposites in Valid Inferences.” The New Scholasticism 34 (2): 141–169. (0 diagrams)

Jacoby, Paul. 1950. “A Triangle of Opposites for Types of Propositions in Aristotelian Logic.” The New Scholasticism 24 (1): 32–56. (6 diagrams)