José R. G. Braga and  Joice B. Mendes and  Guilherme H. Caponetto and  Alexandre C. B. Ramos,  Software Model for a Computer Based Training for an HVDC Control Desk Simulator.   journal   = {International Journal of Computer and Information Engineering}, [online]. World Academy of Science, Engineering and Technology.
    March 2010, vol. 39(3). 359 - 363
    [viewed 07 March 2021]. Available from: https://publications.waset.org/pdf/923.