@article{ZNSL_1994_209_a12,
     author = {V. N. Popov and P. A. Sevastianov},
     title = {Collective excitations in the ferro- and antiferromagnetic states of the two-dimensional repulsive {Hubbard} model},
     journal = {Zapiski Nauchnykh Seminarov POMI},
     pages = {229--259},
     publisher = {mathdoc},
     volume = {209},
     year = {1994},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/ZNSL_1994_209_a12/}
}