TY - JOUR IS - 1-2 JF - Acta scientiarum mathematicarum Y1 - 2013/// KW - Természettudomány KW - Matematika SN - 0001-6969 EP - 41 VL - 79 UR - http://www.acta.hu N1 - Bibliogr.: 41. p.; Abstract SP - 31 AV - restricted ID - acta30861 A1 - Kovács István A1 - Szendrei Mária B. TI - Covering systems of direct products of elementary p-groups are regular ER -