Geodesic
Representation of Hermitian operators with improper scale subspace
Sbornik. Mathematics, Tome 14 (1971) no. 4, pp. 554-564

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The theory of representation of Hermitian operators, constructed by M. G. Krein (UMZh, 1, 2, 1949, 3–66), is carried over to the case where the scale subspace may contain improper elements. Defect numbers of the operator are possibly infinite, and its domain may fail to be dense. Bibliography: 11 titles. 
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     author = {Yu. L. Shmul'yan},
     title = {Representation of {Hermitian} operators with improper scale subspace},
     journal = {Sbornik. Mathematics},
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     volume = {14},
     number = {4},
     year = {1971},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/SM_1971_14_4_a5/}
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Yu. L. Shmul'yan. Representation of Hermitian operators with improper scale subspace. Sbornik. Mathematics, Tome 14 (1971) no. 4, pp. 554-564. http://geodesic.mathdoc.fr/item/SM_1971_14_4_a5/