WASET
    Priyadarsini P.L.K and  Hemalatha T.,  An Alternative Proof for the NP-completeness of Top Right Access point-Minimum Length Corridor Problem.   journal   = {International Journal of Mathematical and Computational Sciences}, [online]. World Academy of Science, Engineering and Technology.
    November 2007, vol. 11(11). 534 - 537
    [viewed 29 March 2024]. Available from: https://publications.waset.org/pdf/6907.