Antonio Breda d’Azevedo,  Restrictedly-Regular Map Representation of n-Dimensional Abstract Polytopes.   journal   = {International Journal of Mathematical and Computational Sciences}, [online]. World Academy of Science, Engineering and Technology.
    October 2018, vol. 143(11). 214 - 217
    [viewed 11 May 2024]. Available from: https://publications.waset.org/pdf/10009756.