%0 Journal Article %A Petronio, Carlo %T The Hurwitz existence problem for surface branched covers %B Winter Braids X (Pisa, 2020) %A Collectif %S Winter Braids Lecture Notes %Z talk:2 %D 2020 %P 1-43 %I Winter Braids School %U http://www.numdam.org/articles/10.5802/wbln.34/ %R 10.5802/wbln.34 %G en %F WBLN_2020__7__A2_0