A note on tolerance lattices of products of lattices Josef Niederle (1982) Časopis pro pěstování matematiky Similarity:
A note on tolerance lattices of algebras with restricted similarity type Bedřich Pondělíček (1995) Acta Universitatis Palackianae Olomucensis. Facultas Rerum Naturalium. Mathematica Similarity:
On structural properties of normality relations on lattices Juhani Nieminen (1977) Archivum Mathematicum Similarity: