Eugene S. Polzik, Klemens Hammerer
Ann. Phys., 527: A15–A20 (2015). doi: 10.1002/andp.201400099, arXiv:1405.3067
http://onlinelibrary.wiley.com/doi/10.1002/andp.201400099/abstract, http://arxiv.org/abs/1405.3067