Geodesic
Electron in a~homogeneous crystal of point atoms with internal structure.~I
Teoretičeskaâ i matematičeskaâ fizika, Tome 72 (1987) no. 3, pp. 403-415

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Spectrum analysis of the Schrödinger operator is performed for the zero-range potential of the three-dimensional lattice type in the presence of internal structure. Inversion formulas are pointed out in which the quasi-momentum plays the part of spectrum analysis. 
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     author = {B. S. Pavlov},
     title = {Electron in a~homogeneous crystal of point atoms with internal {structure.~I}},
     journal = {Teoreti\v{c}eska\^a i matemati\v{c}eska\^a fizika},
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     publisher = {mathdoc},
     volume = {72},
     number = {3},
     year = {1987},
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     url = {http://geodesic.mathdoc.fr/item/TMF_1987_72_3_a7/}
}
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B. S. Pavlov. Electron in a~homogeneous crystal of point atoms with internal structure.~I. Teoretičeskaâ i matematičeskaâ fizika, Tome 72 (1987) no. 3, pp. 403-415. http://geodesic.mathdoc.fr/item/TMF_1987_72_3_a7/