TY - JOUR AU - V. S. Mokeichev AU - A. V. Mokeichev TI - A~new approach to the theory of linear problems for systems of partial differential equations.~I. JO - Izvestiâ vysših učebnyh zavedenij. Matematika PY - 1999 SP - 25 EP - 35 IS - 1 PB - mathdoc UR - http://geodesic.mathdoc.fr/item/IVM_1999_1_a4/ LA - ru ID - IVM_1999_1_a4 ER -