@article{DE_1990_26_6_a7,
     author = {Yu. M. Semenov},
     title = {The structure of the set of almost instantaneous zero-attainability},
     journal = {Differencialʹnye uravneni\^a},
     pages = {989--997},
     publisher = {mathdoc},
     volume = {26},
     number = {6},
     year = {1990},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1990_26_6_a7/}
}