Geodesic
Congruences on pseudocomplemented semilattices
Discussiones Mathematicae. General Algebra and Applications, Tome 20 (2000) no. 2, pp. 219-231

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It is known that congruence lattices of pseudocomplemented semilattices are pseudocomplemented [4]. Many interesting properties of congruences on pseudocomplemented semilattices were described by Sankappanavar in [4], [5], [6]. Except for other results he described congruence distributive pseudocomplemented semilattices [6] and he characterized pseudocomplemented semilattices whose congruence lattices are Stone, i.e. belong to the variety B₁ [5].
Keywords: pseudocomplemented semilattice, congruence lattice, p-algebra, Stone algebra, (relative) (Lₙ)-lattice 
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Heleyová, Zuzana. Congruences on pseudocomplemented semilattices. Discussiones Mathematicae. General Algebra and Applications, Tome 20 (2000) no. 2, pp. 219-231. http://geodesic.mathdoc.fr/item/DMGAA_2000_20_2_a6/