Richard Cleve Peter Høyer Benjamin Toner John Watrous Consequences and Limits of Nonlocal Strategies. 236-249 2004 conf/coco/2004 IEEE Conference on Computational Complexity http://csdl.computer.org/comp/proceedings/ccc/2004/2120/00/21200236abs.htm db/conf/coco/coco2004.html#CleveHTW04