TY - JOUR AU - Ravi P. Agarwal AU - B. Kovacs AU - D. O'Regan TI - Existence of positive solutions for a fourth-order differential system JO - Annales Polonici Mathematici PY - 2014 SP - 301 EP - 312 VL - 112 IS - 3 PB - mathdoc UR - http://geodesic.mathdoc.fr/articles/10.4064/ap112-3-7/ DO - 10.4064/ap112-3-7 LA - en ID - 10_4064_ap112_3_7 ER -