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http://developer.apple.com/library/ios/#documentation/cocoa/Conceptual/Blocks/Articles/00_Introduction.html

http://developer.apple.com/library/ios/#featuredarticles/Short_Practical_Guide_Blocks/_index.html

http://documentation.apple.com/en/logicexpress/instruments/index.html#chapter=11%26section=29%26tasks=true

http://cocoawithlove.com/2009/10/how-blocks-are-implemented-and.html

http://iphonedevelopment.blogspot.in/

http://developer.apple.com/library/ios/#documentation/Performance/Reference/GCD_libdispatch_Ref/Reference/reference.html