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@article{MS2_1961__9_165773, author = {Lars H\"ormander}, title = {Hypoelliptic {Convolution} {Equations.}}, journal = {Mathematica Scandinavica}, pages = {178--184}, publisher = {mathdoc}, volume = {9}, year = {1961}, zbl = {0102.11003}, url = {http://geodesic.mathdoc.fr/item/MS2_1961__9_165773/} }
Lars Hörmander. Hypoelliptic Convolution Equations.. Mathematica Scandinavica, Tome 9 (1961), pp. 178-184. http://geodesic.mathdoc.fr/item/MS2_1961__9_165773/