@article{AL_2006_45_6_a0,
     author = {S. A. Badaev and S. S. Goncharov and A. Sorbi},
     title = {Isomorphism types of {Rogers} semilattices for families from different levels of the arithmetical hierarchy},
     journal = {Algebra i logika},
     pages = {637--654},
     publisher = {mathdoc},
     volume = {45},
     number = {6},
     year = {2006},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/AL_2006_45_6_a0/}
}