@article{IVM_1989_2_a0,
     author = {R. B. Akhtyamov},
     title = {Some remarks on the index sets of canonical recursively enumerable families of finite sets},
     journal = {Izvesti\^a vys\v{s}ih u\v{c}ebnyh zavedenij. Matematika},
     pages = {3--6},
     publisher = {mathdoc},
     number = {2},
     year = {1989},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/IVM_1989_2_a0/}
}