@article{TMF_1977_32_1_a9,
     author = {V. N. Kharkyanen},
     title = {Generalization of the {Heisenberg} {Hamiltonian} for a crystal with allowance for orbital degrees of freedom},
     journal = {Teoreti\v{c}eska\^a i matemati\v{c}eska\^a fizika},
     pages = {114--119},
     publisher = {mathdoc},
     volume = {32},
     number = {1},
     year = {1977},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/TMF_1977_32_1_a9/}
}