Hossain, M. N., Alam, M. S., Hasan, D. M. N., & Mohsin, K. M. (2010). A Highly Nonlinear Spiral Photonic Crystal Fiber for Tailoring Two Zero Dispersion Wavelengths in the Visible Region. Photonics Letters of Poland, 2(3), pp. 143–145. https://doi.org/10.4302/photon. lett. pl.v2i3.138