Geodesic
Bogoliubov group variables for the relativistically invariant systems
Teoretičeskaâ i matematičeskaâ fizika, Tome 111 (1997) no. 3, pp. 413-422

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Bogoliubov group variables for the relativistically invariant systems are considered [1]. Reduction of states number is performed. Expressions for the integrals of motion in the zero-point order with respect to inverted powers of the coupling constant are given as derivatives with respect to group variables. 
@article{TMF_1997_111_3_a7,
     author = {O. A. Khrustalev and M. V. Chichikina},
     title = {Bogoliubov group variables  for the relativistically invariant systems},
     journal = {Teoreti\v{c}eska\^a i matemati\v{c}eska\^a fizika},
     pages = {413--422},
     publisher = {mathdoc},
     volume = {111},
     number = {3},
     year = {1997},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/TMF_1997_111_3_a7/}
}
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O. A. Khrustalev; M. V. Chichikina. Bogoliubov group variables  for the relativistically invariant systems. Teoretičeskaâ i matematičeskaâ fizika, Tome 111 (1997) no. 3, pp. 413-422. http://geodesic.mathdoc.fr/item/TMF_1997_111_3_a7/