TY  - JOUR
AU  - N. V. Assonova
TI  - Hilbert and Bessel Properties of Systems of Root Functions of $2m$th-Order Operators
JO  - Differencialʹnye uravneniâ
PY  - 2001
SP  - 299
EP  - 309
VL  - 37
IS  - 3
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/DE_2001_37_3_a1/
LA  - ru
ID  - DE_2001_37_3_a1
ER  -