@article{SJIM_2012_15_3_a11,
     author = {G. F. Safina},
     title = {Preservation of the frequencies of oscillations of a~pipe with a~liquid},
     journal = {Sibirskij \v{z}urnal industrialʹnoj matematiki},
     pages = {124--134},
     publisher = {mathdoc},
     volume = {15},
     number = {3},
     year = {2012},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/SJIM_2012_15_3_a11/}
}