U. Essen

Shifts and widths of collective excitations in trapped Bose gases determined by the dielectric formalism

H Germany, Budapešť, Hungary., 1999, cond-mat/9911018.

Finite-temperature excitations of Bose gases in anisotropic traps

H Germany, Budapešť, Hungary., 1998, cond-mat/9811012.

CLASSICAL QUASIPARTICLE DYNAMICS IN TRAPPED BOSE CONDENSATES

H Germany, Budapešť, Hungary., 1997, cond-mat/9707122.