Hailu Dessalegn and  T. Srinivas,  Multiple-Channel Piezoelectric Actuated Tunable Optical Filter for WDM Application.   journal   = {International Journal of Physical and Mathematical Sciences}, [online]. World Academy of Science, Engineering and Technology.
    June 2015, vol. 103(7). 369 - 373
    [viewed 19 September 2024]. Available from: https://publications.waset.org/pdf/10001512.