Geodesic
Allowance for interaction symmetry in the theory of extensions
Teoretičeskaâ i matematičeskaâ fizika, Tome 91 (1992) no. 2, pp. 179-191

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A new, symmetry-based approach to the selection of physically meaningful extension parameters – the deficiency subspace $N$ and the self-adjoint operator $\Gamma$ that determines the boundary conditions – is proposed. 
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     author = {A. A. Kiselev and B. S. Pavlov and N. N. Penkina and M. G. Suturin},
     title = {Allowance for interaction symmetry in the theory of extensions},
     journal = {Teoreti\v{c}eska\^a i matemati\v{c}eska\^a fizika},
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     url = {http://geodesic.mathdoc.fr/item/TMF_1992_91_2_a0/}
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A. A. Kiselev; B. S. Pavlov; N. N. Penkina; M. G. Suturin. Allowance for interaction symmetry in the theory of extensions. Teoretičeskaâ i matematičeskaâ fizika, Tome 91 (1992) no. 2, pp. 179-191. http://geodesic.mathdoc.fr/item/TMF_1992_91_2_a0/