@article{TMF_1977_32_2_a7,
     author = {I. A. Vakarchuk},
     title = {Irreducible cluster expansion for the logarithm of the $s$-particle density matrix of a many-boson system},
     journal = {Teoreti\v{c}eska\^a i matemati\v{c}eska\^a fizika},
     pages = {247--261},
     publisher = {mathdoc},
     volume = {32},
     number = {2},
     year = {1977},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/TMF_1977_32_2_a7/}
}