TY  - JOUR
AU  - Nguyên Thị Thiêu Hoa
TI  - Some extremal problems on classes of functions determined by linear differential operators
JO  - Sbornik. Mathematics
PY  - 1991
SP  - 213
EP  - 255
VL  - 68
IS  - 1
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/SM_1991_68_1_a11/
LA  - en
ID  - SM_1991_68_1_a11
ER  -