B. P. PATEL; PROF. (DR.) P. M. GEORGE; PROF. (DR.) V .J .PATEL. Experimental Studies on Perpendicularity of Drilling Operation using DOE. International Journal of Advance Engineering and Research Development (IJAERD), [S. l.], v. 1, n. 3, p. 98–103, 2014. Disponível em: https://ijaerd.org/index.php/IJAERD/article/view/5340. Acesso em: 7 jul. 2025.