Mark Perry Oskar Juhlin Mattias Esbjörnsson Arvid Engström Lean collaboration through video gestures: co-ordinating the production of live televised sport. 2279-2288 2009 CHI http://doi.acm.org/10.1145/1518701.1519051 conf/chi/2009 db/conf/chi/chi2009.html#PerryJEE09