@article{TMF_1974_20_3_a11,
     author = {R. M. Yul'met'yev},
     title = {Investigation of invariants of a~many-particle system by the method of projection operators},
     journal = {Teoreti\v{c}eska\^a i matemati\v{c}eska\^a fizika},
     pages = {413--425},
     publisher = {mathdoc},
     volume = {20},
     number = {3},
     year = {1974},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/TMF_1974_20_3_a11/}
}