TY  - JOUR
AU  - V. I. Blagodatskikh
TI  - Letter to the editors: “A sufficient optimality condition” (Differencial'nye Uravnenija 9 (1973), 416–422)
JO  - Differencialʹnye uravneniâ
PY  - 1973
SP  - 2112
VL  - 9
IS  - 11
UR  - http://geodesic.mathdoc.fr/item/DE_1973_9_11_a28/
LA  - ru
ID  - DE_1973_9_11_a28
ER  -