G. Robertson, D. Armstrong, M. J. P. Dymott, A. I. Ferguson, and G. Hogg, "Diode-pumped lasers for two-photon fluorescence microscopy,"
in Conference on Lasers and Electro-Optics, J. Bowers, D. Miller, D. Scifres, and A. Weiner, eds.,
Vol. 9 of OSA Technical Digest
(Optical Society of America, 1996), paper CTuH2.