@article{DAN_1992_322_1_a15,
     author = {A. V. Solonenko and N. V. Solonenko},
     title = {On the relation between visible periods of oscillations of small},
     journal = {Doklady Akademii Nauk},
     pages = {75--78},
     year = {1992},
     volume = {322},
     number = {1},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1992_322_1_a15/}
}