Pinaki Pratim Acharjya and  Esha Dutta,  Image Segmentation and Contour Recognition Based on Mathematical Morphology.   journal   = {International Journal of Computer and Information Engineering}, [online]. World Academy of Science, Engineering and Technology.
    February 2017, vol. 129(9). 1095 - 1098
    [viewed 19 November 2019]. Available from: https://publications.waset.org/pdf/10008703.