F.M. Sokhatsky

Commutation of operations and its relationship with Menger and Mann superpositions

I. Chajda

A groupoid characterization of Boolean algebras

T.K. Dutta, S. Kar

On ternary semifields

F. Machala, V. Slezak

Lattice-inadmissible incidence structures

S. Cernak

Convergence with a regulator in directed groups

Q. Wang, S.L. Wismath

Generalized inflations and null extensions

R.E. Cawagas

On the structure and zero divisors of the Cayley-Dickson sedenion algebra

D. Stanovsky

On varieties of left distributive left idempotent groupoids