%0 Journal Article %A V. I. Gorbachev %T Eigenfrequencies of longitudinal oscillations for an inhomogeneous rod with variable cross section %J Vestnik Moskovskogo universiteta. Matematika, mehanika %D 2016 %P 31-39 %N 1 %I mathdoc %U http://geodesic.mathdoc.fr/item/VMUMM_2016_1_a4/ %G ru %F VMUMM_2016_1_a4