Geodesic
Relativistic bound $s$-states problem for superposition of two potentials «$\delta$-sphere» type
Problemy fiziki, matematiki i tehniki, no. 2 (2017), pp. 15-19.

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The exact solutions of relativistic two-particle quasipotential type equations for bound states in the case of the potential «$\delta$-sphere» in the relativistic configuration representation and in the case of the superposition of two such potentials are considered. The signs of the coefficients in the $\delta$-potentials that allow the existence of bound states and the maximum possible number of this states are defined on the basis of the analysis of the energy quantization conditions.
Keywords: relativistic two-particle equation, relativistic configurational representation, delta-function potential, bound state, energy quantization condition. 
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Yu. A. Grishechkin; V. N. Kapshai; M. S. Danilchenko. Relativistic bound $s$-states problem for superposition of two potentials «$\delta$-sphere» type. Problemy fiziki, matematiki i tehniki, no. 2 (2017), pp. 15-19. http://geodesic.mathdoc.fr/item/PFMT_2017_2_a2/

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