Voir la notice de l'article provenant de la source Math-Net.Ru
@article{AL_1971_10_3_a1, author = {Yu. L. Ershov}, title = {Computable enumerations of morphisms}, journal = {Algebra i logika}, pages = {247--308}, publisher = {mathdoc}, volume = {10}, number = {3}, year = {1971}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/AL_1971_10_3_a1/} }
Yu. L. Ershov. Computable enumerations of morphisms. Algebra i logika, Tome 10 (1971) no. 3, pp. 247-308. http://geodesic.mathdoc.fr/item/AL_1971_10_3_a1/