Source: https://www.researchgate.net/profile/Kazi-Tani-Nabil/publication/351109868_INITIATION_AU_DESSIN_ASSISTE_PAR_ORDINATEUR_SOUS_AutoCAD/links/6087fef1881fa114b42e10e4/INITIATION-AU-DESSIN-ASSISTE-PAR-ORDINATEUR-SOUS-AutoCAD.pdf