@article{GDZPPN00228832X,
title = {Differential Equations without Solutions.},
journal = {Mathematische Annalen},
volume = {141},
year = {1960},
pages = {169-173},
zbl = {0093.28903},
url = {http://dml.mathdoc.fr/item/GDZPPN00228832X}
}
HÖRMANDER, L. Differential Equations without Solutions.. Mathematische Annalen, Tome 141 (1960) pp. 169-173. http://gdmltest.u-ga.fr/item/GDZPPN00228832X/