@article{MZM_2020_108_1_a7,
     author = {An. A. Muchnik and A. L. Semenov},
     title = {Lattice of {Definability} in the {Order} of {Rational} {Numbers}},
     journal = {Matemati\v{c}eskie zametki},
     pages = {102--118},
     publisher = {mathdoc},
     volume = {108},
     number = {1},
     year = {2020},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_2020_108_1_a7/}
}