@article{VMUMM_2016_1_a4,
     author = {V. I. Gorbachev},
     title = {Eigenfrequencies of longitudinal oscillations for an inhomogeneous rod with variable cross section},
     journal = {Vestnik Moskovskogo universiteta. Matematika, mehanika},
     pages = {31--39},
     publisher = {mathdoc},
     number = {1},
     year = {2016},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/VMUMM_2016_1_a4/}
}