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Two types of retract irreducibility of connected monounary algebras Danica Jakubíková-Studenovská (1996) Mathematica Bohemica Let 𝒜 be a connected monounary algebra. The paper deals with retract irreducibility of 𝒜 in the class of all connected monounary algebras and in the class of all monounary algebras.
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Weak subalgebra lattices of monounary partial algebras Wiktor Bartol (1990) Commentationes Mathematicae Universitatis Carolinae
Конечные решетки как решетки относительных конгруэнций конечных унаров и абелевых групп А.М. Нуракунов (2001) Algebra i Logika
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