TY - JOUR TI - On Sperner families in which no 3 sets have an empty intersection T3 - Acta cybernetica AU - Gronau Hans-Dietrich O. F. PY - 1979 LA - English SN - 0324-721X UR - http://acta.bibl.u-szeged.hu/12280/1/cybernetica_004_fasc_002_213-220.pdf ER -