@article{05142064,
title = {Different types of solvability conditions for differential operators.},
journal = {Electronic Journal of Differential Equations (EJDE) [electronic only]},
volume = {2006},
year = {2006},
zbl = {1118.34003},
language = {en},
url = {http://dml.mathdoc.fr/item/05142064}
}
Kryzhevich, Sergey G.; Volpert, Vitaly A. Different types of solvability conditions for differential operators.. Electronic Journal of Differential Equations (EJDE) [electronic only], Tome 2006 (2006) . http://gdmltest.u-ga.fr/item/05142064/