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@article{MZ_1978__159_172656, author = {Earl A. Coddington and S.V. de Snoo}, title = {Positive {Selfadjoint} {Extensions} of {Positive} {Symmetric} {Subspace.}}, journal = {Mathematische Zeitschrift}, pages = {203--214}, publisher = {mathdoc}, volume = {159}, year = {1978}, zbl = {0358.47015}, url = {http://geodesic.mathdoc.fr/item/MZ_1978__159_172656/} }
Earl A. Coddington; S.V. de Snoo. Positive Selfadjoint Extensions of Positive Symmetric Subspace.. Mathematische Zeitschrift, Tome 159 (1978), pp. 203-214. http://geodesic.mathdoc.fr/item/MZ_1978__159_172656/