Geodesic
Classification of formal $A$-modules in the case of small ramification
Zapiski Nauchnykh Seminarov POMI, Problems in the theory of representations of algebras and groups. Part 27, Tome 430 (2014), pp. 5-12 
S. S. Afanas'eva; S. V. Vostokov. Classification of formal $A$-modules in the case of small ramification. Zapiski Nauchnykh Seminarov POMI, Problems in the theory of representations of algebras and groups. Part 27, Tome 430 (2014), pp. 5-12. http://geodesic.mathdoc.fr/item/ZNSL_2014_430_a0/
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     title = {Classification of formal $A$-modules in the case of small ramification},
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Voir la notice du chapitre de livre provenant de la source Math-Net.Ru

In this paper an explicit classification of formal $A$-modules over the ring of integer of local field up to the strict isomorphism in the case of small ramification is obtained. The canonic representatives in each class of isomorphic formal $A$-modules are described. This results generalizes the classification of $\mathbb Z_p$-modules in small ramification.

[1] M. V. Bondarko, S. V. Vostokov, “Yavnaya klassifikatsiya formalnykh grupp nad lokalnymi polyami”, Teoriya chisel, algebra i algebraicheskaya geometriya, Sbornik statei. K 80-letiyu so dnya rozhdeniya akademika Igorya Rostislavovicha Shafarevicha, Tr. MIAN, 241, Nauka, M., 2003, 43–67 | MR | Zbl

[2] M. Hazewinkel, Formal groups and applications, Acad. Press, New York, 1978 | MR | Zbl