TY - JOUR AU - N. Tarkhanov TI - Unitary Solutions of Partial Differential Equations JO - Mathematica balkanica PY - 2006 SP - 73 VL - 20 IS - 1 PB - mathdoc UR - http://geodesic.mathdoc.fr/item/MABA_2006_20_1_a5/ ID - MABA_2006_20_1_a5 ER -