TY - JOUR AU - Fang, Hui TI - Positive periodic solutions of $N$-species neutral delay systems JO - Czechoslovak Mathematical Journal PY - 2003 SP - 561 EP - 570 VL - 53 IS - 3 UR - http://geodesic.mathdoc.fr/item/CMJ_2003_53_3_a5/ LA - en ID - CMJ_2003_53_3_a5 ER -