Geodesic
Point interaction of two distinguishable particles in an external field
Teoretičeskaâ i matematičeskaâ fizika, Tome 125 (2000) no. 1, pp. 74-90

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We consider a point interaction model for two particles in an external field, which is similar to the Skornyakov–Ter-Martirosyan model and is treated using the theory of self-adjoint extensions of symmetric operators. The corresponding energy operator has an infinite set of bound states with the energy values receding to $-\infty$. 
@article{TMF_2000_125_1_a2,
     author = {M. Kh. Shermatov},
     title = {Point interaction of two distinguishable particles in an external field},
     journal = {Teoreti\v{c}eska\^a i matemati\v{c}eska\^a fizika},
     pages = {74--90},
     publisher = {mathdoc},
     volume = {125},
     number = {1},
     year = {2000},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/TMF_2000_125_1_a2/}
}
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M. Kh. Shermatov. Point interaction of two distinguishable particles in an external field. Teoretičeskaâ i matematičeskaâ fizika, Tome 125 (2000) no. 1, pp. 74-90. http://geodesic.mathdoc.fr/item/TMF_2000_125_1_a2/