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user 31920
Questions asking "What is a good book about X?" or more generally, "What should I read to learn about X?", typically where there is not a single authoritative reference. Please READ THE GUIDANCE IN META (http://meta.physics.stackexchange.com/questions/4697 or click Learn More) before asking.
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Good reading on the Keldysh formalism
If it is still of interest, next to all the excellent suggestions above there is a book from 2013 which I found rather helpful as it makes some neat observations I could not find in other texts:
None …