WASET
    Luís Pina,  System for Monitoring Marine Turtles Using Unstructured Supplementary Service Data.   journal   = {International Journal of Computer and Information Engineering}, [online]. World Academy of Science, Engineering and Technology.
    January 2020, vol. 158(2). 37 - 41
    [viewed 23 April 2024]. Available from: https://publications.waset.org/pdf/10011037.