Geodesic
Families of $p$-divisible groups with constant Newton polygon
Documenta mathematica, Tome 7 (2002), pp. 183-201
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Let X be a p-divisible group with constant Newton polygon over a normal Noetherian scheme S. We prove that there exists an isogeny X→Y such that Y admits a slope filtration. In case S is regular this was proved by N. Katz for dim S=1 and by T. Zink for dim S≥1.
DOI : 10.4171/dm/123
Classification : 14F30, 14L05 
@article{10_4171_dm_123,
     author = {Frans Oort and Thomas Zink},
     title = {Families of $p$-divisible groups with constant {Newton} polygon},
     journal = {Documenta mathematica},
     pages = {183--201},
     year = {2002},
     volume = {7},
     doi = {10.4171/dm/123},
     url = {http://geodesic.mathdoc.fr/articles/10.4171/dm/123/}
}
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Frans Oort; Thomas Zink. Families of $p$-divisible groups with constant Newton polygon. Documenta mathematica, Tome 7 (2002), pp. 183-201. doi: 10.4171/dm/123

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