Geodesic
Homogeneous extensions of the quadratic form of Laplace operator for the field interacting with two point-like particles
Zapiski Nauchnykh Seminarov POMI, Questions of quantum field theory and statistical physics. Part 24, Tome 465 (2017), pp. 46-60

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We consider the set of the closed homogeneous extensions of the quadratic form of Laplace operator, generated by interaction with two point-like sources. We show that this set consists of the trivial (maximal) extension, one point and the subset equivalent to the Riemann sphere. 
@article{ZNSL_2017_465_a3,
     author = {T. A. Bolokhov},
     title = {Homogeneous extensions of the quadratic form of {Laplace} operator for the field interacting with two point-like particles},
     journal = {Zapiski Nauchnykh Seminarov POMI},
     pages = {46--60},
     publisher = {mathdoc},
     volume = {465},
     year = {2017},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/ZNSL_2017_465_a3/}
}
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T. A. Bolokhov. Homogeneous extensions of the quadratic form of Laplace operator for the field interacting with two point-like particles. Zapiski Nauchnykh Seminarov POMI, Questions of quantum field theory and statistical physics. Part 24, Tome 465 (2017), pp. 46-60. http://geodesic.mathdoc.fr/item/ZNSL_2017_465_a3/