@article{AL_1987_26_5_a3,
     author = {Yu. L. Ershov},
     title = {Generability of admissible sets},
     journal = {Algebra i logika},
     pages = {577--596},
     publisher = {mathdoc},
     volume = {26},
     number = {5},
     year = {1987},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/AL_1987_26_5_a3/}
}