Yasuhito Tanaka,  Constructive Proof of the Existence of an Equilibrium in a Competitive Economy with Sequentially Locally Non-Constant Excess Demand Functions.   journal   = {International Journal of Economics and Management Engineering}, [online]. World Academy of Science, Engineering and Technology.
    August 2012, vol. 68(8). 928 - 932
    [viewed 26 April 2024]. Available from: https://publications.waset.org/pdf/6070.