Geodesic
Perturbation theory for relativistic three-dimensional two-particle quasipotential equations
Teoretičeskaâ i matematičeskaâ fizika, Tome 89 (1991) no. 2, pp. 222-227

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Perturbation theory is used to solve a relativistic three-dimensional two-particle quasipotential equation in the configuration representation under the assumption that the particles are heavy and the differential-difference operators in the Hamiltonian can be expanded in powers of the parameter $1/m$. 
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     author = {A. A. Atanasov and E. S. Pisanova},
     title = {Perturbation theory for relativistic three-dimensional two-particle quasipotential equations},
     journal = {Teoreti\v{c}eska\^a i matemati\v{c}eska\^a fizika},
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     url = {http://geodesic.mathdoc.fr/item/TMF_1991_89_2_a5/}
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A. A. Atanasov; E. S. Pisanova. Perturbation theory for relativistic three-dimensional two-particle quasipotential equations. Teoretičeskaâ i matematičeskaâ fizika, Tome 89 (1991) no. 2, pp. 222-227. http://geodesic.mathdoc.fr/item/TMF_1991_89_2_a5/