TY - JOUR AU - P. B. Kagan TI - Sobolev functional spaces of negative order and their application to the Neumann problem JO - Izvestiâ vysših učebnyh zavedenij. Matematika PY - 1962 SP - 43 EP - 46 IS - 5 PB - mathdoc UR - http://geodesic.mathdoc.fr/item/IVM_1962_5_a5/ LA - ru ID - IVM_1962_5_a5 ER -