Elementary Excitation by Temperature in a Nonideal Bose-Einstein System

Spectrum of elementary excitations of a nonideal Bose gas

Elementary excitations and superfluidity in Bose-Einstein condensates

Temperature Green's Functions for Weakly Nonideal Bose-Einstein Systems

Bose-Einstein condensation of a nonideal gas

Elementary excitations of spinor Bose-Einstein condensates

Elementary Excitations in Bose-Condensed Liquids and Gases at Finite Temperatures