Geodesic
Lutz filtration of formal groups
Izvestiya. Mathematics , Tome 9 (1975) no. 6, pp. 1155-1167.

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In this paper we study the filtrations of formal groups that arise when studying elliptic curves over a local field. We characterize the fields obtained by dividing the points of a formal group by an isogeny. Our technique is then applied to describe the norm mapping in a $\Gamma$-extension of the ground field. Bibliography: 10 titles. 
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M. I. Bashmakov; A. N. Kirillov. Lutz filtration of formal groups. Izvestiya. Mathematics , Tome 9 (1975) no. 6, pp. 1155-1167. http://geodesic.mathdoc.fr/item/IM2_1975_9_6_a0/

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