TY  - JOUR
AU  - L. N. Lyapin
TI  - Upper and lower solution of equations of evolution type
JO  - Differencialʹnye uravneniâ
PY  - 1980
SP  - 1885
EP  - 1887
VL  - 16
IS  - 10
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/DE_1980_16_10_a18/
LA  - ru
ID  - DE_1980_16_10_a18
ER  -