@article{IVM_1988_2_a1,
     author = {J. R. Arteaga and A. P. Norden},
     title = {Mathematical principles for the classification of energy states},
     journal = {Izvesti\^a vys\v{s}ih u\v{c}ebnyh zavedenij. Matematika},
     pages = {9--14},
     publisher = {mathdoc},
     number = {2},
     year = {1988},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/IVM_1988_2_a1/}
}