The algebraic theory of order. - Hans-E. Porst (Appl. Categorical Struct., 1993)

What is concrete equivalence? - Hans-E. Porst (Appl. Categorical Struct., 1994)

Concrete categories are concretely equivalent iff their uniquely transportable modifications are strict concretely isomorphic. - Hans-E. Porst (Appl. Categorical Struct., 1996)

Editorial. - Hans-E. Porst (Appl. Categorical Struct., 2000)

Minimal Generators in Varieties. - Hans-E. Porst (Appl. Categorical Struct., 2000)

The Essentially Equational Theory of Horn Classes. - Hans-E. Porst (Math. Log. Q., 2000)

From Varieties of Algebras to Covarieties of Coalgebras. - Jirí Adámek; Hans-E. Porst (CMCS, 2001)

On Varieties and Covarieties in a Category. - Jirí Adámek; Hans-E. Porst (Math. Struct. Comput. Sci., 2003)

Residually Small Varieties Without Rank. - Hans-E. Porst (Appl. Categorical Struct., 2004)

On tree coalgebras and coalgebra presentations. - Jirí Adámek; Hans-E. Porst (Theor. Comput. Sci., 2004)

Fundamental Constructions for Coalgebras, Corings, and Comodules. - Hans-E. Porst (Appl. Categorical Struct., 2008)

Free Internal Groups. - Hans-E. Porst (Appl. Categorical Struct., 2012)

Generalizations of the Sweedler Dual. - Hans-E. Porst; Ross Street (Appl. Categorical Struct., 2016)

Hopf Monoids in semi-additive Varieties. - Hans-E. Porst (CoRR, 2016)

Hopf and Lie algebras in semi-additive Varieties. - Hans-E. Porst (Log. Methods Comput. Sci., 2017)