Mojtaba Hakimi-Moghaddam,  A Survey on Positive Real and Strictly Positive Real Scalar Transfer Functions.   journal   = {International Journal of Mathematical and Computational Sciences}, [online]. World Academy of Science, Engineering and Technology.
    January 2016, vol. 110(2). 57 - 63
    [viewed 21 September 2024]. Available from: https://publications.waset.org/pdf/10003656.