Two characterizations of hypercubes.
Filters and Simple Graphic Algebras.
Remarks on Ideals in Join-Semilattices.
On the Graph for which there is a Tree as the Inverse Interchange Graph of a Local Graph.
About Generalized Ideals in a Distributive Lattice.
On translations in quasidistributive semilattices
The ideal structure of simple ternary algebras
On the canonical subdirect decomposition of a join semilattice
Tolerance relations on complete lattices
Boolean graphs
On normality relation and its generalization on lattices
Operations on graphs determining congruences on graphs
On structural properties of normality relations on lattices
On prime and principal ideals on graphs
Tolerance relations on simple ternary algebras
On the algebraic structure of fuzzy sets of type 2
On nonblocking and rearrangeable communication graphs
Atomicity of tolerance lattices
Relations, coverings, hypergraphs and matroids
Direct decomposability of tolerances on lattices, semilattices and quasilattices
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