@article{TMF_2006_149_2_a7,
     author = {I. G. Bostrem and A. S. Ovchinnikov and V. E. Sinitsyn},
     title = {The~method of exact diagonalization preserving the~total spin and},
     journal = {Teoreti\v{c}eska\^a i matemati\v{c}eska\^a fizika},
     pages = {262--280},
     year = {2006},
     volume = {149},
     number = {2},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/TMF_2006_149_2_a7/}
}