@article{02107653,
title = {Beurling vectors of quasielliptic systems of differential operators.},
journal = {JIPAM. Journal of Inequalities in Pure \& Applied Mathematics [electronic only]},
volume = {4},
year = {2003},
zbl = {1058.35069},
language = {en},
url = {http://dml.mathdoc.fr/item/02107653}
}
Chaili, Rachid. Beurling vectors of quasielliptic systems of differential operators.. JIPAM. Journal of Inequalities in Pure & Applied Mathematics [electronic only], Tome 4 (2003) . http://gdmltest.u-ga.fr/item/02107653/