Geodesic
Existence of families without positive numerations
Matematičeskie zametki, Tome 13 (1973) no. 4, pp. 597-604

Voir la notice de l'article provenant de la source Math-Net.Ru

An example is constructed of a computable family of recursively enumerable sets which does not have computable positive numerations but does possess a computable minimal numeration. 
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     author = {S. S. Marchenkov},
     title = {Existence of families without positive numerations},
     journal = {Matemati\v{c}eskie zametki},
     pages = {597--604},
     publisher = {mathdoc},
     volume = {13},
     number = {4},
     year = {1973},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_1973_13_4_a15/}
}
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S. S. Marchenkov. Existence of families without positive numerations. Matematičeskie zametki, Tome 13 (1973) no. 4, pp. 597-604. http://geodesic.mathdoc.fr/item/MZM_1973_13_4_a15/