Geodesic
Calculation of correlation functions for interacting quasiparticles in crystals
Teoretičeskaâ i matematičeskaâ fizika, Tome 16 (1973) no. 3, pp. 406-413

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A method is proposed for calculating many-time correlation functions. A generalization of Wick's theorem for interacting quasiparticles is obtained. 
@article{TMF_1973_16_3_a11,
     author = {S. I. Dudkin},
     title = {Calculation of correlation functions for interacting quasiparticles in crystals},
     journal = {Teoreti\v{c}eska\^a i matemati\v{c}eska\^a fizika},
     pages = {406--413},
     publisher = {mathdoc},
     volume = {16},
     number = {3},
     year = {1973},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/TMF_1973_16_3_a11/}
}
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S. I. Dudkin. Calculation of correlation functions for interacting quasiparticles in crystals. Teoretičeskaâ i matematičeskaâ fizika, Tome 16 (1973) no. 3, pp. 406-413. http://geodesic.mathdoc.fr/item/TMF_1973_16_3_a11/