@Misc{ GhiSpo16, author = { Ghiraldin, Francesco and Spolaor, Luca }, title = { On the number of singular points for planar multivalued harmonic functions }, journal = { Manuscripta Math. }, year = { 2016 }, pages = { }, URL = { http://cvgmt.sns.it/paper/2893/ }, note = { cvgmt preprint} }