Chia-Jung Chen and  Rong-Shine Lin and  Rong-Guey Chang,  Efficient Web-Learning Collision Detection Tool on Five-Axis Machine.   journal   = {International Journal of Educational and Pedagogical Sciences}, [online]. World Academy of Science, Engineering and Technology.
    July 2013, vol. 79(7). 2045 - 2049
    [viewed 05 April 2020]. Available from: https://publications.waset.org/pdf/16447.