Ismail, Aiman, et al. “Erbium-Doped Fiber Amplification Assisted Multi-Wavelength Brillouin-Raman Fiber Laser”. International Journal of Engineering & Technology, vol. 7, no. 4.35, Nov. 2018, pp. 854-6, https://doi.org/10.14419/ijet.v7i4.35.26269.