On Descent Theory for Monoid Actions. - Valdis Laan (Appl. Categorical Struct., 2004)

Limit Preservation Properties of the Greatest Semilattice Image Functor. - George Janelidze; Valdis Laan; László Márki (Int. J. Algebra Comput., 2008)

Context equivalence of semigroups. - Valdis Laan (Period. Math. Hung., 2010)

On Morita Equivalence of Partially Ordered Monoids. - Valdis Laan (Appl. Categorical Struct., 2014)

On congruence extension properties for ordered algebras. - Valdis Laan; Sohail Nasir; Lauri Tart (Period. Math. Hung., 2015)

Morita equivalence of factorizable semigroups. - Valdis Laan; Ülo Reimaa (Int. J. Algebra Comput., 2019)

Injective Hulls are Completions of Ordered Algebras. - Xia Zhang; Valdis Laan; Jianjun Feng (Order, 2024)