@article{2495,
author = {Biesterfeldt, H.J. jr.},
title = {Summability of series of polynomial solutions to a hypoelliptic equation},
journal = {Portugaliae mathematica},
volume = {25},
year = {1966},
pages = {147-164},
zbl = {0173.12201},
mrnumber = {0233991},
language = {en},
url = {http://dml.mathdoc.fr/item/2495}
}
Biesterfeldt, H.J. jr. Summability of series of polynomial solutions to a hypoelliptic equation. Portugaliae mathematica, Tome 25 (1966) pp. 147-164. http://gdmltest.u-ga.fr/item/2495/