VAN NIEKERK, S.; STEYN, H. DEFINING . The South African Journal of Industrial Engineering, [S. l.], v. 22, n. 1, 2011. DOI: 10.7166/22-1-38. Disponível em: http://sajie.journals.ac.za/pub/article/view/38. Acesso em: 28 apr. 2024.