- Optics Express, Vol. 21, Issue 11, pp. 13522-13532 (June 2013)
- Justin B. Spring, Patrick S. Salter, Benjamin J. Metcalf, Peter C. Humphreys, Merritt Moore, Nicholas Thomas-Peter, Marco Barbieri, Xian-Min Jin, Nathan K. Langford, W. Steven Kolthammer, Martin J. Booth, Ian A. Walmsley