Barbosa-Saucedo, Édgar Alejandro, Santos Gracia-Villar, and Luis Alonso Dzul-López. “How to Improve Business Competitiveness in Tamaulipas?: Six Sigma, an Alternative for Small and Medium Enterprises”. CienciaUAT 5, no. 3 (February 28, 2011): 56-60. Accessed July 3, 2024. https://revistaciencia.uat.edu.mx/index.php/CienciaUAT/article/view/88.