TY - JOUR AU - Jakubík, Ján TI - Closure operators on the lattice of radical classes of lattice ordered groups JO - Czechoslovak Mathematical Journal PY - 1988 SP - 71 EP - 77 VL - 38 IS - 1 PB - mathdoc UR - http://geodesic.mathdoc.fr/articles/10.21136/CMJ.1988.102201/ DO - 10.21136/CMJ.1988.102201 LA - en ID - 10_21136_CMJ_1988_102201 ER -