3) E. Snitzer, H. Po, F. Hakimi, R. Tumminelli, and B.C. McCollum, "Double-clad, offset core Nd fiber laser," in Optical Fiber Sensors, Vol.2 of 1988 OSA Technical Digest Series (1988), postdeadline paper PD5
4) David J. DiGiovanni and Martin H. Muendel: "High power fiber laser and amplifiers" Optics & Photonics News, January (1999), 26.
5) D.J. DiGiovanni: "Fiber Laser Fiber" in Proc. of CLEO (2005) CTuC1