@article{MMO_1992_54_a1,
     author = {Yu. D. Golovatyǐ},
     title = {Spectral properties of oscillatory systems with added masses},
     journal = {Trudy Moskovskogo matemati\v{c}eskogo ob\^{s}estva},
     pages = {29--72},
     publisher = {mathdoc},
     volume = {54},
     year = {1992},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MMO_1992_54_a1/}
}