Geodesic
Extensions of symmetric operators and symmetric binary relations
Matematičeskie zametki, Tome 17 (1975) no. 1, pp. 41-48.

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Various classes of extensions of symmetric operators with equal (finite or infinite) defect numbers are described in terms of abstract boundary conditions. The dual problem of the description of extensions of a symmetric binary relation is also considered. 
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     author = {A. N. Kochubei},
     title = {Extensions of symmetric operators and symmetric binary relations},
     journal = {Matemati\v{c}eskie zametki},
     pages = {41--48},
     publisher = {mathdoc},
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     number = {1},
     year = {1975},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_1975_17_1_a4/}
}
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A. N. Kochubei. Extensions of symmetric operators and symmetric binary relations. Matematičeskie zametki, Tome 17 (1975) no. 1, pp. 41-48. http://geodesic.mathdoc.fr/item/MZM_1975_17_1_a4/