TY  - JOUR
AU  - E. E. Bukzhalev
TI  - On the Construction of Upper and Lower Solutions by the Nagumo Method
JO  - Differencialʹnye uravneniâ
PY  - 2004
SP  - 723
EP  - 730
VL  - 40
IS  - 6
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/DE_2004_40_6_a0/
LA  - ru
ID  - DE_2004_40_6_a0
ER  -