WASET
    Bahare Fatemi and  Seyed Mehran Kazemi and  Nazanin Mehrasa,  Rating and Generating Sudoku Puzzles Based On Constraint Satisfaction Problems.   journal   = {International Journal of Computer and Information Engineering}, [online]. World Academy of Science, Engineering and Technology.
    September 2014, vol. 94(10). 1816 - 1821
    [viewed 29 March 2024]. Available from: https://publications.waset.org/pdf/9999524.