Dewi Nasien and  Habibollah Haron and  Siti SophiayatiYuhaniz,  Metaheuristics Methods (GA and ACO) for Minimizing the Length of Freeman Chain Code from Handwritten Isolated Characters.   journal   = {International Journal of Computer and Information Engineering}, [online]. World Academy of Science, Engineering and Technology.
    March 2010, vol. 38(2). 223 - 228
    [viewed 19 April 2021]. Available from: https://publications.waset.org/pdf/13608.