TY - JOUR AU - L. Stupyalis TI - Initial-boundary value problems for equations of mixed type JO - Informatics and Automation PY - 1975 SP - 115 EP - 145 VL - 127 PB - mathdoc UR - http://geodesic.mathdoc.fr/item/TRSPY_1975_127_a8/ LA - ru ID - TRSPY_1975_127_a8 ER -