TY - JOUR AU - Zdzisław Denkowski TI - The boundary value problems for ordinary non-linear differential and difference equations of the fourth order JO - Annales Polonici Mathematici PY - 1970 SP - 87 EP - 102 VL - 24 IS - 1 PB - mathdoc UR - http://geodesic.mathdoc.fr/articles/10.4064/ap-24-1-87-102/ DO - 10.4064/ap-24-1-87-102 LA - en ID - 10_4064_ap_24_1_87_102 ER -