Bayram Unal, M.Caterina Netti, Majid A. Hassan, Peter J. Ayliffe, Martin D.B. Charlton, Fernando Lahoz, Nicolas M.B. Perney, David P. Shepherd, Chao-Yi Tai, James S. Wilkinson & Greg J. Parker,
2005, IEEE Journal of Quantum Electronics, 41(12), 1565-1573