Geodesic
On regressive enumerations
Diskretnaya Matematika, Tome 9 (1997) no. 2, pp. 116-119.

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We demonstrate that any regressive set can have either exactly one or denumerable many regressive enumerations (up to equivalence), and describe the sets possessing a single regressive enumeration. 
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     author = {V. L. Mikheev},
     title = {On regressive enumerations},
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V. L. Mikheev. On regressive enumerations. Diskretnaya Matematika, Tome 9 (1997) no. 2, pp. 116-119. http://geodesic.mathdoc.fr/item/DM_1997_9_2_a11/