Norhashidah Hj. Mohd Ali and  Teng Wai Ping,  New Fourth Order Explicit Group Method in the Solution of the Helmholtz Equation.   journal   = {International Journal of Mathematical and Computational Sciences}, [online]. World Academy of Science, Engineering and Technology.
    January 2015, vol. 97(1). 7 - 11
    [viewed 05 May 2024]. Available from: https://publications.waset.org/pdf/10000115.