References Ext functor

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gelfand, sergei i.; manin, yuri ivanovich (1999), homological algebra, berlin: springer, isbn 978-3-540-65378-3 
weibel, charles a. (1994). introduction homological algebra. cambridge studies in advanced mathematics. 38. cambridge university press. isbn 978-0-521-55987-4. mr 1269324. oclc 36131259. 






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