L. Dong, J. Pinkstone, P. S. J. Russell, and D. N. Payne, "Study of UV absorption in germanosilicate fiber preforms,"
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 CWK4.