Partially Hypoelliptic Differential Equations of Finite Type.
Mathematica Scandinavica, Tome 9 (1961), pp. 22-42
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@article{MS2_1961__9_165760,
author = {J\"oran Friberg},
title = {Partially {Hypoelliptic} {Differential} {Equations} of {Finite} {Type.}},
journal = {Mathematica Scandinavica},
pages = {22--42},
publisher = {mathdoc},
volume = {9},
year = {1961},
zbl = {0108.10201},
url = {http://geodesic.mathdoc.fr/item/MS2_1961__9_165760/}
}
Jöran Friberg. Partially Hypoelliptic Differential Equations of Finite Type.. Mathematica Scandinavica, Tome 9 (1961), pp. 22-42. http://geodesic.mathdoc.fr/item/MS2_1961__9_165760/