Geodesic
On the automorphisms of surfaces of general type in positive characteristic
Atti della Accademia nazionale dei Lincei. Rendiconti Lincei. Matematica e applicazioni, Série 9, Tome 4 (1993) no. 2, pp. 121-129.

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Here we give an explicit polynomial bound (in term of \( K^{2}_{X} \) and not depending on the prime \( p \)) for the order of the automorphism group of a minimal surface \( X \) of general type defined over a field of characteristic \( p > 0 \).
In questa Nota diamo una limitazione superiore esplicita di tipo polinomiale (in funzione solo di \( K^{2}_{X} \) e non dipendente dal primo \( p \)) per l'ordine del gruppo degli automorfismi di una superficie generale \( X \) definita su un campo di caratteristica \( p > 0 \). 
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Ballico, Edoardo. On the automorphisms of surfaces of general type in positive characteristic. Atti della Accademia nazionale dei Lincei. Rendiconti Lincei. Matematica e applicazioni, Série 9, Tome 4 (1993) no. 2, pp. 121-129. http://geodesic.mathdoc.fr/item/RLIN_1993_9_4_2_a6/

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