WASET
    Zainab Yasir Al-Rekaby and  Abdul Jalil M. Khalaf,  On Chromaticity of Wheels.   journal   = {International Journal of Mathematical and Computational Sciences}, [online]. World Academy of Science, Engineering and Technology.
    September 2014, vol. 92(8). 1149 - 1152
    [viewed 20 April 2024]. Available from: https://publications.waset.org/pdf/9999407.