Geodesic
On the automorphisms of surfaces of general type in positive characteristic, II
Atti della Accademia nazionale dei Lincei. Rendiconti Lincei. Matematica e applicazioni, Série 9, Tome 5 (1994) no. 1, pp. 63-68

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Here we give an upper polynomial bound (as function of \( K_{X^{2}} \) but independent on \( p \)) for the order of a \( p \)-subgroup of \( Aut (X)_{red} \) with \( X \) minimal surface of general type defined over the field \( K \) with \( char (K) = p > 0 \). Then we discuss the non existence of similar bounds for the dimension as \( K \)-vector space of the structural sheaf of the scheme \( Aut(X) \). 
Ballico, Edoardo. On the automorphisms of surfaces of general type in positive characteristic, II. Atti della Accademia nazionale dei Lincei. Rendiconti Lincei. Matematica e applicazioni, Série 9, Tome 5 (1994) no. 1, pp. 63-68. http://geodesic.mathdoc.fr/item/RLIN_1994_9_5_1_a7/
@article{RLIN_1994_9_5_1_a7,
     author = {Ballico, Edoardo},
     title = {On the automorphisms of surfaces of general type in positive characteristic, {II}},
     journal = {Atti della Accademia nazionale dei Lincei. Rendiconti Lincei. Matematica e applicazioni},
     pages = {63--68},
     year = {1994},
     volume = {Ser. 9, 5},
     number = {1},
     zbl = {0827.14028},
     mrnumber = {MR1273894},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/RLIN_1994_9_5_1_a7/}
}
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