TY - JOUR JF - NONLINEAR ANALYSIS-HYBRID SYSTEMS ID - publicatio8597 AV - restricted A1 - Röst Gergely A1 - Vizi Zsolt Y1 - 2014/// TI - Backward bifurcation for pulse vaccination VL - 14 EP - 113 SN - 1751-570X UR - http://publicatio.bibl.u-szeged.hu/8597/ SP - 99 ER -