Voir la notice de l'article provenant de la source European Digital Mathematics Library
@article{MAN_1978__233_163109, author = {Ian Knowles}, title = {On the {Existence} of {Minimal} {Operators} for {Schr\"odinger-Type} {Differential} {Expressions.}}, journal = {Mathematische Annalen}, pages = {221--228}, publisher = {mathdoc}, volume = {233}, year = {1978}, zbl = {0376.35016}, url = {http://geodesic.mathdoc.fr/item/MAN_1978__233_163109/} }
Ian Knowles. On the Existence of Minimal Operators for Schrödinger-Type Differential Expressions.. Mathematische Annalen, Tome 233 (1978), pp. 221-228. http://geodesic.mathdoc.fr/item/MAN_1978__233_163109/