@article{WBLN_2020__7__A2_0,
     author = {Petronio, Carlo},
     title = {The {Hurwitz} existence problem for surface branched covers},
     booktitle = {Winter Braids X (Pisa, 2020)},
     series = {Winter Braids Lecture Notes},
     note = {talk:2},
     pages = {1--43},
     publisher = {Winter Braids School},
     year = {2020},
     doi = {10.5802/wbln.34},
     language = {en},
     url = {http://archive.numdam.org/articles/10.5802/wbln.34/}
}