@article{DAN_1964_155_6_a8,
     author = {Ya. Z. Tsypkin},
     title = {An estimate of the degree of stability of non-linear sample-data systems},
     journal = {Doklady Akademii Nauk},
     pages = {1272--1273},
     publisher = {mathdoc},
     volume = {155},
     number = {6},
     year = {1964},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1964_155_6_a8/}
}