@article{IVM_1980_5_a1,
     author = {A. D. Vainshtein and B. Z. Shapiro},
     title = {Structure of a~set of $\bar a$-representable numbers},
     journal = {Izvesti\^a vys\v{s}ih u\v{c}ebnyh zavedenij. Matematika},
     pages = {8--11},
     year = {1980},
     number = {5},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/IVM_1980_5_a1/}
}