Islam, M. M. (2011) “Wavelength Dependence of Guiding Properties in Highly Birefringent Elliptical Ring Core Optical Fiber”, Journal of Electrical Engineering, 36(2), pp. 10–15. Available at: https://www.banglajol.info/index.php/JEE/article/view/8091 (Accessed: 2 January 2026).