TY - JOUR AU - A. K. Prikarpatskii AU - N. N. Bogolyubov TI - A bilocal periodic problem for Sturm--Liouville and Dirac differential operators, and some applications in the theory of nonlinear dynamical systems JO - Doklady Akademii Nauk PY - 1990 SP - 29 EP - 32 VL - 310 IS - 1 PB - mathdoc UR - http://geodesic.mathdoc.fr/item/DAN_1990_310_1_a5/ LA - ru ID - DAN_1990_310_1_a5 ER -