TY - JOUR AU - Jakubíková-Studenovská, Danica AU - Pócs, Jozef TI - Test elements and the Retract Theorem for monounary algebras JO - Czechoslovak Mathematical Journal PY - 2007 SP - 975 EP - 986 VL - 57 IS - 3 PB - mathdoc UR - http://geodesic.mathdoc.fr/item/CMJ_2007__57_3_a14/ LA - en ID - CMJ_2007__57_3_a14 ER -