@article{DAN_1972_202_3_a15,
     author = {F. Kh. Tselman},
     title = {``Resonance'' in small oscillations of the spherical pendulum},
     journal = {Doklady Akademii Nauk},
     pages = {553--554},
     publisher = {mathdoc},
     volume = {202},
     number = {3},
     year = {1972},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1972_202_3_a15/}
}