Representability of concrete categories by non-constant morphisms Jiří Rosický, Věra Trnková (1989) Archivum Mathematicum
Representation of ordered classes by classes of connected unary algebras Oldřich Kopeček (1978) Archivum Mathematicum
Representations in varieties of regular involution bands Václav Koubek (1990) Commentationes Mathematicae Universitatis Carolinae
Representations of bipartite completed posets. A.V. Roiter, L.A. Nazarova (1988) Commentarii mathematici Helvetici