Transactions of the American Mathematical Society · 1944 · 227 citations · 5 references
5
Theory of equivalence relations
Öystein Ore · Duke Mathematical Journal · 1942 · 161 citations
The Closure Operators of a Lattice
Morgan Ward · Annals of Mathematics · 1942 · 142 citations
Combinations of Closure Relations
Öystein Ore · Annals of Mathematics · 1943 · 54 citations
Some studies on closure relations
Öystein Ore · Duke Mathematical Journal · 1943 · 41 citations
Öystein Ore · Transactions of the American Mathematical Society · 1942 · 21 citations