Geodesic
Diagram technique for Hubbard operators
Teoretičeskaâ i matematičeskaâ fizika, Tome 19 (1974) no. 3, pp. 423-429 Cet article a éte moissonné depuis la source Math-Net.Ru

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A diagram technique for Hubbard operators is proposed on the basis of the Wick theorem and cumulant expansions. A prescription is given for calculating the Green's functions and correlation functions constructed from such operators. 
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P. M. Slobodyan; I. V. Stasyuk. Diagram technique for Hubbard operators. Teoretičeskaâ i matematičeskaâ fizika, Tome 19 (1974) no. 3, pp. 423-429. http://geodesic.mathdoc.fr/item/TMF_1974_19_3_a12/

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