@article{TMF_2009_160_1_a20,
     author = {V. A. Verbus and L. Martina and A. P. Protogenov},
     title = {Bloch {Hamiltonians} and topologically ordered states},
     journal = {Teoreti\v{c}eska\^a i matemati\v{c}eska\^a fizika},
     pages = {220--228},
     publisher = {mathdoc},
     volume = {160},
     number = {1},
     year = {2009},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/TMF_2009_160_1_a20/}
}