http://www.develop-online.net/news/why-epic-abandoned-its-outdated-model-and-offered-everyone-access-to-unreal-engine-4/0190696

http://box2d.org/2014/03/gdc-2014-physics-tutorial/

http://www.essentialmath.com/GDC2014/GDC14_frames.pdf

https://docs.google.com/file/d/0B11iL4IgOgWLdFhzalpmX2kzSmM/edit

http://www.dtecta.com/files/GDC14_VanDenBergen_Gino_Math_Tut.pdf

http://www.gamespot.com/videos/battlefield-4-creating-a-more-dynamic-battlefield/2300-6417875/

http://www.iguanademos.com/Jare/wp/?p=2763