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Varma, Hari M and Vasu, Mohan R and Nandakumaran, AK (2007) Direct reconstruction of complex refractive index distribution from boundary measurement of intensity and normal derivative of intensity. In: Journal of the Optical Society of America A, 24 (10). pp. 3089-3099.
Kumar, Shiva and Srinivas, T and Selvarajan, A (1991) Transform technique for planar optical waveguides. In: Journal of the Optical Society of America A, 8 (11). pp. 1681-1687.