Geodesic
Distinguished isogenies for formal groups in local fields with small ramification
Zapiski Nauchnykh Seminarov POMI, Problems in the theory of representations of algebras and groups. Part 13, Tome 330 (2006), pp. 93-100

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We prove the existence of distinguished isogenies for formal groups defined over the ring of integers of a local field with ramification index less than the characteristic of the residue field. This generalizes the result of Demchenko for Honda formal groups. 
@article{ZNSL_2006_330_a4,
     author = {S. V. Vostokov and B. M. Bekker},
     title = {Distinguished isogenies for formal groups in local fields with small ramification},
     journal = {Zapiski Nauchnykh Seminarov POMI},
     pages = {93--100},
     publisher = {mathdoc},
     volume = {330},
     year = {2006},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/ZNSL_2006_330_a4/}
}
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S. V. Vostokov; B. M. Bekker. Distinguished isogenies for formal groups in local fields with small ramification. Zapiski Nauchnykh Seminarov POMI, Problems in the theory of representations of algebras and groups. Part 13, Tome 330 (2006), pp. 93-100. http://geodesic.mathdoc.fr/item/ZNSL_2006_330_a4/