Geodesic
On Elements of Order $p^s$ in the Plane Cremona Group over a Field of Characteristic $p$
Informatics and Automation, Multidimensional algebraic geometry, Tome 264 (2009), pp. 55-62 
I. V. Dolgachev. On Elements of Order $p^s$ in the Plane Cremona Group over a Field of Characteristic $p$. Informatics and Automation, Multidimensional algebraic geometry, Tome 264 (2009), pp. 55-62. http://geodesic.mathdoc.fr/item/TRSPY_2009_264_a5/
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Voir la notice de l'article provenant de la source Math-Net.Ru

We show that the plane Cremona group over a field of characteristic $p>0$ does not contain elements of order of power of $p$ larger than $2$. We also describe conjugacy classes of elements of order $p^2$.

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