Sizhong Zhou and  Hongxia Liu,  A Neighborhood Condition for Fractional k-deleted Graphs.   journal   = {International Journal of Mathematical and Computational Sciences}, [online]. World Academy of Science, Engineering and Technology.
    January 2010, vol. 37(1). 202 - 204
    [viewed 22 October 2019]. Available from: https://publications.waset.org/pdf/4161.