TY - JOUR AU - Fei Long AU - Bingwen Liu TI - Existence and uniqueness of positive periodic solutions of delayed Nicholson's blowflies models JO - Annales Polonici Mathematici PY - 2012 SP - 217 EP - 228 VL - 103 IS - 3 PB - mathdoc UR - http://geodesic.mathdoc.fr/articles/10.4064/ap103-3-1/ DO - 10.4064/ap103-3-1 LA - en ID - 10_4064_ap103_3_1 ER -