@article{TMF_2021_208_2_a9,
     author = {A. G. Sergeev},
     title = {On mathematical problems in the~theory of~topological insulators},
     journal = {Teoreti\v{c}eska\^a i matemati\v{c}eska\^a fizika},
     pages = {342--354},
     publisher = {mathdoc},
     volume = {208},
     number = {2},
     year = {2021},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/TMF_2021_208_2_a9/}
}