1. K. Thyagarajan, B.P. Pal, A. Kumar, Characterisation of Optical Fibers – Part II: Single-mode Fibers, Fundamentals of Fiber Optics in Telecommunications and Sensor Systems, B.P. Pal (Ed.), Wiley Eastern, New Delhi and John Wiley, New York, Chapter 11, 1992.
2. D.L. Franzen, A Short Course on Single-mode Fiber Measurements, Presented at OFC'90, San Francisco, CA, 1990.
3. Gaussian approximation of the fundamental modes of graded-index fibers