@article{DAN_1963_149_3_a25,
     author = {M. M. Simkin},
     title = {Complex steady motions in nonlinear sampled-data systems},
     journal = {Doklady Akademii Nauk},
     pages = {586--588},
     publisher = {mathdoc},
     volume = {149},
     number = {3},
     year = {1963},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1963_149_3_a25/}
}