Geodesic
On $p$-Reducibility of Computable Numerations
Matematičeskie zametki, Tome 69 (2001) no. 1, pp. 31-35.

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It is proved that if $\nu_1$ and $\nu_2$ are two computable numerations of a certain family of recursively enumerable sets such that $\nu_2$ and $\nu_1$ is not a $p$-principal numeration, then there exists a computable numeration $\nu_0$ p-incomparable with $\nu_1$ such that $\nu_2$. This yields the description of injective objects and the absence of numerated sets projective in the category $K_p$ conforming to $p$-reducibility of computable numeration. 
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A. N. Degtev. On $p$-Reducibility of Computable Numerations. Matematičeskie zametki, Tome 69 (2001) no. 1, pp. 31-35. http://geodesic.mathdoc.fr/item/MZM_2001_69_1_a2/

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