Geodesic
Covariant two-particle wave functions for model quasipotentials that admit exact solutions.~I. Solutions in momentum space
Teoretičeskaâ i matematičeskaâ fizika, Tome 54 (1983) no. 3, pp. 406-415

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Covariant two-particle equations (the Logunov–Tavkhelidze equation and an equation projected onto positive-frequency states) are solved exactly for some model quasipotentials (including some containing a part corresponding to repulsion at short distances) in the momentum representation. The conditions of normalization and orthogonality of the wave functions are considered. 
@article{TMF_1983_54_3_a8,
     author = {V. N. Kapshai and N. B. Skachkov},
     title = {Covariant two-particle wave functions for model quasipotentials that admit exact {solutions.~I.} {Solutions} in momentum space},
     journal = {Teoreti\v{c}eska\^a i matemati\v{c}eska\^a fizika},
     pages = {406--415},
     publisher = {mathdoc},
     volume = {54},
     number = {3},
     year = {1983},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/TMF_1983_54_3_a8/}
}
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V. N. Kapshai; N. B. Skachkov. Covariant two-particle wave functions for model quasipotentials that admit exact solutions.~I. Solutions in momentum space. Teoretičeskaâ i matematičeskaâ fizika, Tome 54 (1983) no. 3, pp. 406-415. http://geodesic.mathdoc.fr/item/TMF_1983_54_3_a8/