@article{DAN_1995_341_1_a13,
     author = {V. L. Krupenin},
     title = {Asymmetric oscillations in systems that contain two-sided},
     journal = {Doklady Akademii Nauk},
     pages = {49--52},
     publisher = {mathdoc},
     volume = {341},
     number = {1},
     year = {1995},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1995_341_1_a13/}
}