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@article{MAN_1971__195_162229, author = {H.O. Cordes}, title = {Self-Adjointness of {Powers} of {Elliptic} {Operators} on {Non-Compact} {Manifolds.}}, journal = {Mathematische Annalen}, pages = {257--272}, publisher = {mathdoc}, volume = {195}, year = {1971}, zbl = {0235.47021}, url = {http://geodesic.mathdoc.fr/item/MAN_1971__195_162229/} }
H.O. Cordes. Self-Adjointness of Powers of Elliptic Operators on Non-Compact Manifolds.. Mathematische Annalen, Tome 195 (1971), pp. 257-272. http://geodesic.mathdoc.fr/item/MAN_1971__195_162229/