TY  - JOUR
AU  - E. L. Tonkov
TI  - Disconjugacy and number of switchings in a linear time-optimal nonstationary system
JO  - Differencialʹnye uravneniâ
PY  - 1973
SP  - 2180
EP  - 2185
VL  - 9
IS  - 12
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/DE_1973_9_12_a8/
LA  - ru
ID  - DE_1973_9_12_a8
ER  -