@article{RM_1999_54_3_a11,
     author = {An. A. Muchnik and S. E. Positsel'skii},
     title = {A~class of enumerable sets},
     journal = {Trudy Matematicheskogo Instituta imeni V.A. Steklova},
     pages = {640--641},
     publisher = {mathdoc},
     volume = {54},
     number = {3},
     year = {1999},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/RM_1999_54_3_a11/}
}