A. Kartashova

Cardinalities of lattices of topologies of unars and some related topics

H.J. Vogel

On the structure of halfdiagonal-halfterminal-symmetric categories with diagonal inversions

I. Chajda, G. Eigenthaler

Some modifications of congruence permutability and dually congruence regular varietie

K. Denecke, J. Koppitz, S.L. Wismath

The semantical hyperunification problem

W. Guo, K.P. Shum

Minimal formations of universal algebras

S.R. Park, S.Z. Song

Maximal column rank preservers of fuzzy matrices

Sr. Arworn, K. Denecke

Tree transformations defined by hypersubstitutions

I. Chajda, H. Langer

Congruence classes in Brouwerian semilattices

D. Dorninger, H. Langer, M. Maczyński

Ring-like structures with unique symmetric difference related to quantum logic

J. Płonka

The lattice of subvarieties of the biregularization of the variety of Boolean algebras