WASET
    Ber-Lin Yu and  Ting-Zhu Huang,  A Note on Potentially Power-Positive Sign Patterns.   journal   = {International Journal of Mathematical and Computational Sciences}, [online]. World Academy of Science, Engineering and Technology.
    April 2011, vol. 52(4). 600 - 602
    [viewed 26 April 2024]. Available from: https://publications.waset.org/pdf/3610.