Tiu, Z. , Ahmad, H. , Harun, S. (2014). 'Multi-Wavelength Q-Switched Erbium-Doped Fiber Laser with Photonic Crystal Fiber and Multi-Walled Carbon Nanotubes'. World Academy of Science, Engineering and Technology, Open Science Index 94, International Journal of Physical and Mathematical Sciences, 8(10), 1284 - 1287.