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@article{MS2_1961__9_165779, author = {Jaak Peetre}, title = {On {Estimating} the {Solutions} of {Hypoelliptic} {Differential} {Equations} {Near} the {Plane} {Boundary.}}, journal = {Mathematica Scandinavica}, pages = {337--351}, publisher = {mathdoc}, volume = {9}, year = {1961}, zbl = {0113.30601}, url = {http://geodesic.mathdoc.fr/item/MS2_1961__9_165779/} }
Jaak Peetre. On Estimating the Solutions of Hypoelliptic Differential Equations Near the Plane Boundary.. Mathematica Scandinavica, Tome 9 (1961), pp. 337-351. http://geodesic.mathdoc.fr/item/MS2_1961__9_165779/