On the Existence of Minimal Operators for Schrödinger-Type Differential Expressions.
Mathematische Annalen, Tome 233 (1978), pp. 221-228.

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@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/}
}
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%0 Journal Article
%A Ian Knowles
%T On the Existence of Minimal Operators for Schrödinger-Type Differential Expressions.
%J Mathematische Annalen
%D 1978
%P 221-228
%V 233
%I mathdoc
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%F 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/