TY - JOUR AU - E. K. Makarov TI - The Characteristic Sets of Multidimensional Equations with Respect to a Polyhedral Cone Can Be Nonclosed JO - Differencialʹnye uravneniâ PY - 2003 SP - 560 EP - 562 VL - 39 IS - 4 PB - mathdoc UR - http://geodesic.mathdoc.fr/item/DE_2003_39_4_a14/ LA - ru ID - DE_2003_39_4_a14 ER -