Geodesic
On the extension of a~$J$-Hermitian operator with nondense domain of definition
Matematičeskie zametki, Tome 17 (1975) no. 5, pp. 737-743.

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In this paper a theorem is proved on the existence of $J$-self-adjoint extensions for a nondensely defined $J$-Hermitian operator whose regularity field is nonempty. 
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     author = {L. M. Raikh},
     title = {On the extension of a~$J${-Hermitian} operator with nondense domain of definition},
     journal = {Matemati\v{c}eskie zametki},
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     publisher = {mathdoc},
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     year = {1975},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_1975_17_5_a6/}
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L. M. Raikh. On the extension of a~$J$-Hermitian operator with nondense domain of definition. Matematičeskie zametki, Tome 17 (1975) no. 5, pp. 737-743. http://geodesic.mathdoc.fr/item/MZM_1975_17_5_a6/