%0 Journal Article %A G. Chobanov %A I. Dimovski %T Extension of the Duhamel Principle for Time-Nonlocal Boundary Value Problems %J Mathematica balkanica %D 2004 %P 259 %V 18 %N 3-4 %I mathdoc %U http://geodesic.mathdoc.fr/item/MABA_2004_18_3-4_a4/ %F MABA_2004_18_3-4_a4