@article{AL_2020_59_3_a1,
     author = {S. A. Badaev and N. A. Bazhenov and B. S. Kalmurzaev},
     title = {The structure of computably enumerable preorder relations},
     journal = {Algebra i logika},
     pages = {293--314},
     publisher = {mathdoc},
     volume = {59},
     number = {3},
     year = {2020},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/AL_2020_59_3_a1/}
}