Principal congruences of $p$-algebras and double $p$-algebras
T. Hecht, T. Katriň{ák · Proceedings of the American Mathematical Society · 1976
Principal congruence of pseudocomplemented lattices (= $p$-algebras) and of double pseudocomplemented lattices (= double $p$-algebras), i.e. pseudocomplemented and dual pseudocomplemented ones, are characterized.