WASET
    Sizhong Zhou,  A Sufficient Condition for Graphs to Have Hamiltonian [a, b]-Factors.   journal   = {International Journal of Mathematical and Computational Sciences}, [online]. World Academy of Science, Engineering and Technology.
    September 2009, vol. 33(9). 704 - 706
    [viewed 29 March 2024]. Available from: https://publications.waset.org/pdf/10536.