Institute of Mathematics and Informatics,

Bulgarian Academy of Sciences,

1113 Sofia, Bulgaria

E-mail: ,

Bulgarian Academy of Sciences,

1113 Sofia, Bulgaria

E-mail: ,

- Finite 2-groups with a non-Dedekind non-metacyclic norm of Abelian non-cyclic subgroups
**n-Torsion Regular Rings**- On invariant submanifolds of S-manifolds
- On fully idempotent semimodules
- On generalization of the notion of Moufang loop to n-ary case
- Finite Non-commutative Associative Algebras for Setting the Hidden Discrete Logarithm Problem and Post-quantum Cryptoschemes on its Base
- On the number of topologies on countable fields
- Isohedral tilings by 14-, 16- and 18-gons for hyperbolic translation group of genus two
- A note on almost contact metric 2- and 3-hypersurfaces in
**W_4**-manifolds - Morita contexts and closure operators in modules
- Examples of bipartite graphs which are not cyclically-interval colorable
- Academician Vladimir Arnautov 80th anniversary