Geodesic
Relativistic system of interacting points as a discrete string
Teoretičeskaâ i matematičeskaâ fizika, Tome 73 (1987) no. 2, pp. 294-301 
V. D. Gershun; A. I. Pashnev. Relativistic system of interacting points as a discrete string. Teoretičeskaâ i matematičeskaâ fizika, Tome 73 (1987) no. 2, pp. 294-301. http://geodesic.mathdoc.fr/item/TMF_1987_73_2_a11/
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     author = {V. D. Gershun and A. I. Pashnev},
     title = {Relativistic system of interacting points as a~discrete string},
     journal = {Teoreti\v{c}eska\^a i matemati\v{c}eska\^a fizika},
     pages = {294--301},
     year = {1987},
     volume = {73},
     number = {2},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/TMF_1987_73_2_a11/}
}
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Voir la notice de l'article provenant de la source Math-Net.Ru

A model which is a discrete modification of the string model is suggested for describing $N$-particle relativistic quantum system. Physical state spectrum for $N=2$ and $N=3$ is obtained. In the last case the model possesses an internal symmetry group under which all the physical states are singlets.

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