TY  - JOUR
AU  - G. A. Kurina
TI  - Invertibility of Nonnegatively Hamiltonian Operators in a Hilbert Space
JO  - Differencialʹnye uravneniâ
PY  - 2001
SP  - 839
EP  - 841
VL  - 37
IS  - 6
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/DE_2001_37_6_a15/
LA  - ru
ID  - DE_2001_37_6_a15
ER  -