Hereditary radical classes of linearly ordered groups Mária Jakubíková (1983) Časopis pro pěstování matematiky
Homomorphisms between complete chains and the independence of the axioms of limitoid Roberto Peirone (1989) Rendiconti del Seminario Matematico della Università di Padova
Homomorphisms of contexts and isomorphisms of concept lattices František Machala, Marek Pomp (1996) Acta Universitatis Palackianae Olomucensis. Facultas Rerum Naturalium. Mathematica