1. D. Gloge, The optical fibre as a transmission medium. Rpts. Prog. Phys. 42, 1777–1824 (1979)
2. D.B. Keck, Fundamentals of optical waveguide fibers. IEEE Commun. Mag. 23, 17–22 (1985)
3. J.D. Musgraves, J. Hu, L. Calvez, Springer Handbook of Glass (Springer, Berlin, 2019)
4. R. Olshansky, Propagation in glass optical waveguides. Rev. Mod. Phys. 51, 341–367 (1979)
5. S.R. Nagel, in Fiber Materials and Fabrication Methods, ed. by S.E. Miller, I.P. Kaminow. Optical Fiber Telecommunications–II (Academic, 1988)