valvesoftware.com/publications/2009/ai_systems_of_l4d_mike_booth.pdf
revistagamer.com/2012/04/26/steam-llegaria-a-linux-y-ya-corre-l4d-2/
formspring.me/aargentina/q/314551639518220874?_sg=&_sk=
g4tv.com/thefeed/blog/post/723953/payday-the-heist-dev-teams-with-valve-on-co-op-game/
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