Indagationes Mathematicae (Proceedings) · 1967 · 27 citations · 3 references
3
Subdirect unions in universal algebra
Garrett Birkhoff · Bulletin of the American Mathematical Society · 1944 · 200 citations · Full text
On Intermediate Propositional Logics
A. S. Troelstra · Indagationes Mathematicae (Proceedings) · 1965 · 60 citations
Humanities, Mathematics, Philosophy +12
Some results for implicational calculi
R. A. Bull · Journal of Symbolic Logic · 1964 · 18 citations
Humanities, Mathematics, Logic +8