monounary algebra; connected monounary algebra; retract; retract irreducibility
Let $\Cal A$ be a connected monounary algebra. The paper deals with retract irreducibility of $\Cal A$ in the class of all connected monounary algebras and in the class of all monounary algebras.
 D. Jаkubíková-Studenovská: Retract irreduciblity of connected monounary algebras I
. Czechoslovak Math. J. To appear. MR 1388617
 D. Jаkubíková-Studenovská: Retгact iгreduciblity of connected monounaгy algebras II. Czechoslovak Math. J. To appear.