A. A. G. . Xavier, F. M. . Bentes, M. de J. R. da . Nóbrega, F. B. da . Silva Martins, and H. R. de . Queiroz, “CNC Machine Building Through Open Sources Projects and Programs”, Int J Innov Educ Res, vol. 8, no. 9, pp. 108–118, Sep. 2020, doi: 10.31686/ijier.vol8.iss9.2600.