Possible 3-divisible A2^n configurations of smooth rational curves on K3 surfaces in char 3 are described and the resulting triple covers are fully classified.
Katsura, Lefschetz pencils on a certain hypersurface in positive characteristic, Advanced Studies
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The 3-divisibility of divisors on K3 surfaces in characteristic 3
Possible 3-divisible A2^n configurations of smooth rational curves on K3 surfaces in char 3 are described and the resulting triple covers are fully classified.