Geodesic
Generalized diagram technique of nonequilibrium processes
Teoretičeskaâ i matematičeskaâ fizika, Tome 55 (1983) no. 1, pp. 137-142

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Keldysh's diagram technique is generalized to the case of an arbitrary initial density matrix of a system of both fermions and bosons. 
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     author = {S. S. Fanchenko},
     title = {Generalized diagram technique of nonequilibrium processes},
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S. S. Fanchenko. Generalized diagram technique of nonequilibrium processes. Teoretičeskaâ i matematičeskaâ fizika, Tome 55 (1983) no. 1, pp. 137-142. http://geodesic.mathdoc.fr/item/TMF_1983_55_1_a12/