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Boolean Algebras with Operators. Part I
Bjàrni Jónsson, Alfred Tarski · American Journal of Mathematics · 1951 · 757 citations
Robert Goldblatt · Annals of Pure and Applied Logic · 1989 · 291 citations
Varieties of relation algebras
Bjàrni Jónsson · Algebra Universalis · 1982 · 138 citations