2 citations to https://www.mathnet.ru/rus/tmf64

1. Bogolyubov N. N. Jr., Sankovich D.P., “An Approximating Hamiltonian Method in the Theory of Imperfect Bose Gases”, Physical Properties of Nanosystems, Nato Security Through Science Series B: Physics and Biophysics, 2011, 203–212      
2. Corgini, M, “Bogolyubov approximation for diagonal model of an interacting Bose gas”, Physics Letters A, 360:3 (2007), 419