- Optics Express, Vol. 17, Issue 22, pp. 19926-19932 (October 2009)
- L. Lever, N. M. Hinchcliffe, S. P. Khanna, P. Dean, Z. Ikonic, C. A. Evans, A. G. Davies, P. Harrison, E. H. Linfield, R. W. Kelsall
- Optics Express, Vol. 17, Issue 22, pp. 20476-20483 (October 2009)
- J. M. Hensley, Juan Montoya, M. G. Allen, J. Xu, L. Mahler, A. Tredicucci, H. E. Beere, D. A. Ritchie
- Chinese Optics Letters, Vol. 7, Issue 8, pp. 709-711 (August 2009)
- Lifeng Hou, Gang Zhong, Yingjie Zhao, Yongzhuang Yang, Yuxia Wang, Yongqin Hao, Yuan Feng, Xiaoguang Jiang, Haorui Xie