@article{VNGU_2011_11_3_a4,
     author = {N. A. Baklanova},
     title = {Minimal {Elements} and {Minimal} {Covers} in {Rogers} {Semilattice} of {Computable} {Numberings} in {Hyperarithmetical} {Hierarchy}},
     journal = {Sibirskij \v{z}urnal \v{c}istoj i prikladnoj matematiki},
     pages = {77--84},
     publisher = {mathdoc},
     volume = {11},
     number = {3},
     year = {2011},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/VNGU_2011_11_3_a4/}
}