On branched Riemann surfaces and braid groups as fundamental groups of configuration spaces of points:
Proving the Hurwitz theorem:
Adolf Hurwitz, Über die Composition der quadratischen Formen von beliebig vielen Variabeln, Nachr. Ges. Wiss. Göttingen (1898) pp 309–316 (GDZ pdf, EuDML entry)
Adolf Hurwitz, Über die Komposition der quadratischen Formen, Math. Ann. 88 (1923) pp 1–25, doi:10.1007/bf01448439 (GDZ pdf, EuDML entry)
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