Geodesic
$q$-finite morphisms in formal algebraic geometry
Izvestiya. Mathematics , Tome 9 (1975) no. 1, pp. 27-62.

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In this paper we introduce definitions and study properties of $q$-finite and $q$-acyclic morphisms of formal algebraic spaces. We give criteria for the existence of formal contractions in terms of 1-finite morphisms. We use these criteria to prove the existence of certain modifications and the algebraizability of certain formal morphisms. Bibliography: 15 items. 
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F. L. Zak. $q$-finite morphisms in formal algebraic geometry. Izvestiya. Mathematics , Tome 9 (1975) no. 1, pp. 27-62. http://geodesic.mathdoc.fr/item/IM2_1975_9_1_a3/

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