TY - JOUR AU - Petronio, Carlo TI - The Hurwitz existence problem for surface branched covers BT - Winter Braids X (Pisa, 2020) AU - Collectif T3 - Winter Braids Lecture Notes N1 - talk:2 PY - 2020 SP - 1 EP - 43 PB - Winter Braids School UR - http://www.numdam.org/articles/10.5802/wbln.34/ DO - 10.5802/wbln.34 LA - en ID - WBLN_2020__7__A2_0 ER -