Voir la notice de l'article provenant de la source Math-Net.Ru
@article{AL_1990_29_4_a0, author = {N. V. Beliakin}, title = {Effective hierarchies}, journal = {Algebra i logika}, pages = {385--397}, publisher = {mathdoc}, volume = {29}, number = {4}, year = {1990}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/AL_1990_29_4_a0/} }
N. V. Beliakin. Effective hierarchies. Algebra i logika, Tome 29 (1990) no. 4, pp. 385-397. http://geodesic.mathdoc.fr/item/AL_1990_29_4_a0/