%0 Journal Article %A I. V. Dolgachev %T On Elements of Order $p^s$ in the Plane Cremona Group over a~Field of Characteristic~$p$ %J Trudy Matematicheskogo Instituta imeni V.A. Steklova %D 2009 %P 55-62 %V 264 %I mathdoc %U http://geodesic.mathdoc.fr/item/TM_2009_264_a5/ %G en %F TM_2009_264_a5