TY - JOUR TI - Summaries of articles published in this issue JO - Czechoslovak Mathematical Journal PY - 1980 SP - 511 VL - 30 IS - 4 UR - http://geodesic.mathdoc.fr/articles/10.21136/CMJ.1980.101701/ DO - 10.21136/CMJ.1980.101701 LA - en ID - 10_21136_CMJ_1980_101701 ER -