The Depth of a Hypersubstitution. - Klaus Denecke; Jörg Koppitz; Slavcho Shtrakov (J. Autom. Lang. Comb., 2001)

Multi-hypersubstitutions and Colored Solid Varieties. - Klaus Denecke; Jörg Koppitz; Slavcho Shtrakov (Int. J. Algebra Comput., 2006)

Tree automata and separable sets of input variables - Slavcho Shtrakov; Vladimir Shtrakov (CoRR, 2007)

Tree Automata and Essential Input Variables - Slavcho Shtrakov (CoRR, 2007)

Essential Inputs and Minimal Tree Automata - Ivo Damyanov; Slavcho Shtrakov (CoRR, 2007)

Tree Automata and Essential Subtrees - Slavcho Shtrakov (CoRR, 2007)

Composition of Terms and Essential Positions in Deduction - Slavcho Shtrakov (CoRR, 2008)

Essential arity gap of Boolean functions - Slavcho Shtrakov (CoRR, 2008)

Essential Arity Gap of k-Valued Functions - Slavcho Shtrakov (CoRR, 2008)

Symmetric functions with non-trivial arity gap - Slavcho Shtrakov; Jörg Koppitz (CoRR, 2010)

On the complexity of finite valued functions. - Slavcho Shtrakov; Ivo Damyanov (CoRR, 2015)

Minor complexities of finite operations. - Slavcho Shtrakov (CoRR, 2016)

On the Computational Complexity of Finite Operations. - Slavcho Shtrakov; Ivo Damyanov (Int. J. Found. Comput. Sci., 2016)