TY - JOUR AU - N. Bozhinov TI - On the Root Function Expansion of a Nonlocal First Order Integro-Differential Operator JO - Mathematica balkanica PY - 1998 SP - 225 VL - 12 IS - 1-2 PB - mathdoc UR - http://geodesic.mathdoc.fr/item/MABA_1998_12_1-2_a18/ ID - MABA_1998_12_1-2_a18 ER -