Identities for globals (complex algebras) of algebras G. Grätzer, H. Lakser (1988) Colloquium Mathematicae
Independent basis for the identities of entropic groupoids György Pollák, Ágnes Szendrei (1981) Commentationes Mathematicae Universitatis Carolinae
Isotone analogs of results by Mal'tsev and Rosenberg. Larose, Benoit (2005) Beiträge zur Algebra und Geometrie