http://jfi.uchicago.edu/~qchen/Papers/PhysRep412p1-88.pdf
This is a (lengthy) paper which looks at some similarities/differences between BECs and BCS theory for superconductors. Its a bit long to go through all of it, but the introduction is quite interesting in raising some ideas, about how BECs and BCS superconductors show properties which are two sides of the same coin.
this is good illustrated paper but it is too long
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