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@article{PORMA_1993__50_1_115810, author = {Beazer, R.}, title = {Principal congruence properties of some algebras with pseudocomplementation}, journal = {Portugaliae mathematica}, pages = {75--86}, publisher = {mathdoc}, volume = {50}, number = {1}, year = {1993}, mrnumber = {1300587}, zbl = {0801.06023}, language = {en}, url = {http://geodesic.mathdoc.fr/item/PORMA_1993__50_1_115810/} }
Beazer, R. Principal congruence properties of some algebras with pseudocomplementation. Portugaliae mathematica, Tome 50 (1993) no. 1, pp. 75-86. http://geodesic.mathdoc.fr/item/PORMA_1993__50_1_115810/