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Ryu, C. ., Andersen, M. F., Clade, P. ., Natarajan, V. ., Helmerson, K. ., & Phillips, W. D. (2007). Observation of persistent flow of a Bose-Einstein condensate in a toroidal trap. Physical Review Letters, 99. http://doi.org/10.1103/PhysRevLett.99.260401

Clade, P. ., Ryu, C. ., Ramanathan, A. ., Helmerson, K. ., & Phillips, W. D. (2009). Observation of a 2D Bose Gas: From Thermal to Quasicondensate to Superfluid. Physical Review Letters, 102. http://doi.org/10.1103/PhysRevLett.102.170401