TY - JOUR AU - T. A. Osechkina TI - Unique solvability and sign constancy of the Green function of a~periodic boundary value problem for a~linear equation with deviating argument JO - Izvestiâ vysših učebnyh zavedenij. Matematika PY - 1993 SP - 86 EP - 94 IS - 5 PB - mathdoc UR - http://geodesic.mathdoc.fr/item/IVM_1993_5_a9/ LA - ru ID - IVM_1993_5_a9 ER -