TY - JOUR TI - News and Notices JO - Czechoslovak Mathematical Journal PY - 1968 VL - 18 IS - 2 PB - mathdoc UR - http://geodesic.mathdoc.fr/articles/10.21136/CMJ.1968.100838/ DO - 10.21136/CMJ.1968.100838 LA - en ID - 10_21136_CMJ_1968_100838 ER -