Multi-step Bose-Einstein Condensation of Trapped Ideal Bose Gases
  The Phenomenon of multi-step Bose-Einstein condensation (BEC) of a finite number of non-interacting bosons in anisotropic traps has been demonstrated by studing the populations on eight subsets of states. The cusp in the specific heat is found to be associated with the crossover between subsets of states involving Bose functions $g_{n}(z)$ of different classes, as specified by their behaviour at $z=1$. {PACS: 03.75.Fi, 05.30.-d, 64.60.-i} 
Wenji Deng (Department of Physics, South China University of   Technology, Guangzhou, China)