** M. Afkhami, K. Khashyarmanesh and F. Shahsavar**
On the properties of zero-divisor graphs of posets, pp.1-16

** W. Atiponrat and R. Maungchang**
Continuous homomorphisms, the left-gyroaddition action and topological quotient gyrogroups, pp.17-28

** G. Biyogmam, S. Tchamna and C. Tcheka**
From quotient trigroups to groups, pp.29-41

** M. Borralho**
The transitivity of primary conjugacy in a class of semigroups, pp.43-46

** S.S. Davidov and D.A. Shahnazaryan**
Hyperidentities with permutations leading to the isotopy
of invertible binary algebras to a group, pp.47-52

** W.A. Dudek and R.A.R. Monzo**
Translatability determines the structure
of certain types of idempotent quasigroups, pp.53-76

** K. Hansda and A. Jamadar**
Characterization of inverse ordered semigroups
by their ordered idempotents and bi-ideals, pp.77-88

** A. Hasanvand and R. Rezaei**
The equivalence graph of the comaximal graph of a group, pp.89-100

** M. Hassanzadeh and S. Sutlu**
Matched pairs of m-invertible Hopf quasigroups, pp.101-138

** T. Imran, M. Ashiq and M.A. Zaighum**
Computational approach for intransitive action of Delta(2,4,k) on PL(F

_{q}), pp.139-148

** S. Kar, A. Roy and I. Dutta**
On regularities in po-ternary semigroups, pp.149-158

** H.B. Shelash and A.R. Ashrafi**
Table of marks and markaracter table of certain finite groups, pp.159-170

### vol.28 (2020) No. 2

**W.A. Dudek**
In memoriam: Valentin S. Trokhimenko, pp.171-176

**A. Babai**
On the connectivity of the proper intersection power graph, pp.177-182

**N.N. Didurik and I.A. Florja**
Some properties of i-quasigroups, pp.183-194

**W.A. Dudek**
On Belousov-Moufang quasigroups, pp.195-202

**W.A. Dudek and R.A.R. Monzo**
Translatable quadratical quasigroups, pp.203-228

**G. Hiss and L. Ortjohann**
A note on the construction of right conjugacy closed loops, pp.229-236

**P. Kumar**
Maximal cyclic subgroups of a finite abelian p-group of rank two, pp.237-242

**S. Maity and A.K. Bhuniya**
On the component graphs of finitely generated free semimodules, pp.243-250

**N.N. Malyutina**
Cryptanalysis of some stream ciphers based on n-ary groupoids, pp.251-268

**D.N. Moldovyan, A.A. Moldovyan and N.A. Moldovyan**
An enhanced version of the hidden discrete logarithm problem and its algebraic support, pp.269-284

**R.A.R. Monzo**
Division on semigroups that are semilattices of groups, pp.285-299

**J. Sanborisoot and T. Changphas**
Semigroups in which the radical of every quasi-ideal is a subsemigroup, pp.301-308

**J. Sanborisoot and T. Changphas**
On ordered semigroups satisfying certain regularity conditions, pp.309-318

**V.G. Skobelev and V.V. Skobelev**
Families of semi-automata in finite quasigroups and iterated hash functions, pp.319-338