Dewi Nasien and  Siti S. Yuhaniz and  Habibollah Haron,  Recognition of Isolated Handwritten Latin Characters using One Continuous Route of Freeman Chain Code Representation and Feedforward Neural Network Classifier.   journal   = {International Journal of Computer and Information Engineering}, [online]. World Academy of Science, Engineering and Technology.
    July 2010, vol. 43(7). 1145 - 1151
    [viewed 22 October 2021]. Available from: https://publications.waset.org/pdf/8886.