Arrangements of Hyperplanes, Higher Braid Groups and Higher Bruhat Orders
Yu. I. Manin, V. V. Schechtman · World scientific series in 20th century mathematics · 1996
In conclusion we would like to thank V. A. Hinich, who explained to us the notion of n-category used in section 3, and 0. V. Ogievetsky who helped us to prove the main theorem of section 2. § 1. Discriminantal arrangements and higher braid groups