MEASUREMENT AND ANALYSIS OF CUSTOMER SATISFACTION USING SIX SIGMA IN NIGERIAN BANKING INDUSTRY. The Journals of the Nigerian Association of Mathematical Physics, [S. l.], v. 64, p. 165–170, 2022. Disponível em: https://nampjournals.org.ng/index.php/home/article/view/103.. Acesso em: 23 nov. 2024.