@article{TMF_1991_86_2_a9,
     author = {V. M. Zharkov},
     title = {Transformation of electron spectrum in the {Hubbard} model},
     journal = {Teoreti\v{c}eska\^a i matemati\v{c}eska\^a fizika},
     pages = {262--271},
     year = {1991},
     volume = {86},
     number = {2},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/TMF_1991_86_2_a9/}
}