%0 Journal Article %A L. D. Pustyl'nikov %T On the spectrum of the~discrete inhomogeneous wave equation, and vibrations of a~discrete string %J Sbornik. Mathematics %D 1993 %P 317-331 %V 75 %N 2 %I mathdoc %U http://geodesic.mathdoc.fr/item/SM_1993_75_2_a1/ %G en %F SM_1993_75_2_a1