Aaron Halfaker Aniket Kittur John Riedl Don't bite the newbies: how reverts affect the quantity and quality of Wikipedia work. 163-172 2011 Int. Sym. Wikis http://doi.acm.org/10.1145/2038558.2038585 conf/wikis/2011 db/conf/wikis/wikis2011.html#HalfakerKR11