T. Wolf, S. Illek, J. Rieger, B. Borchert, and M. -. Amann, "Extended continuous tuning range (over 10 nm) of tunable twin-guide lasers,"
in Conference on Lasers and Electro-Optics, T. Baer, A. Smirl, J. Bowers, and D. Miller, eds.,
Vol. 8 of OSA Technical Digest
(Optical Society of America, 1994), paper CWB1.