@article{IVM_2018_1_a7,
     author = {Ya. A. Mikhailovskaya and A. N. Frolov},
     title = {Computable linear orders and the {Ershov} hierarchy},
     journal = {Izvesti\^a vys\v{s}ih u\v{c}ebnyh zavedenij. Matematika},
     pages = {67--74},
     publisher = {mathdoc},
     number = {1},
     year = {2018},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/IVM_2018_1_a7/}
}