TY - JOUR AU - Yuji Liu AU - Xiaohui Yang TI - Existence and non-existence of positive solutions of four-point BVPs for second order ordinary differential equations on whole line JO - Novi Sad Journal of Mathematics PY - 2016 SP - 79 EP - 103 VL - 46 IS - 1 PB - mathdoc UR - http://geodesic.mathdoc.fr/articles/10.30755/NSJOM.02415/ DO - 10.30755/NSJOM.02415 ID - 10.30755/NSJOM.02415 ER -