Elementary excitations of the trapped Bose-condensed gas
Patrik Öhberg, E.L. Surkov, Ilkka Juhani Tittonen, Stig Stenholm, Martin Wilkens, Georgy V. Shlyapnikov
Patrik Öhberg, E.L. Surkov, Ilkka Juhani Tittonen, Stig Stenholm, Martin Wilkens, Georgy V. Shlyapnikov