GOCE, B.; GLIGORCE, V. 626.MYSTERY SHOPPERS AND NET PROMOTER SCORE TOOLS FOR CUSTOMER SATISFACTION IMPROVEMENT. MECHANICAL ENGINEERING – SCIENTIFIC JOURNAL, [S. l.], v. 38, n. 1, p. 17–28, 2021. DOI: 10.55302/MESJ20381626017b. Disponível em: https://mesj.ukim.edu.mk/journals/article/view/38. Acesso em: 19 jan. 2026.