Geodesic
Construction of theory of a binary mixture of nonideal bose gases (or liquids) by the method of collective variables. II. The $s$-particle density matrices at $T=0$. Variational calculation of the ground-state energy and density-density correlation functions
Teoretičeskaâ i matematičeskaâ fizika, Tome 71 (1987) no. 1, pp. 114-128 
G. O. Balabanyan. Construction of theory of a binary mixture of nonideal bose gases (or liquids) by the method of collective variables. II. The $s$-particle density matrices at $T=0$. Variational calculation of the ground-state energy and density-density correlation functions. Teoretičeskaâ i matematičeskaâ fizika, Tome 71 (1987) no. 1, pp. 114-128. http://geodesic.mathdoc.fr/item/TMF_1987_71_1_a11/
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     title = {Construction of theory of a~binary mixture of nonideal bose gases (or~liquids) by the method of collective variables. {II.~The} $s$-particle density matrices at $T=0$. {Variational} calculation of the ground-state energy and density-density correlation functions},
     journal = {Teoreti\v{c}eska\^a i matemati\v{c}eska\^a fizika},
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Voir la notice de l'article provenant de la source Math-Net.Ru

In the framework of collective variables method for binary mixture of non-ideal Bose-gases (liquids) $s$-particle density matrices at $T=0$ are found. The ground state energy, the excitation spectrum and correlation functions “density-density” are calculated by means of variational method. The accordance between zero-order approximations of the variational and microscopic approaches is demenstrated. Binary mixture of Bose-gases of equal masses is taken as an example of a model of the “pseudopotential of hard spheres”.

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