HAKIM, S. N.; KALIJAGA, A.; INDRAWATI, S. SERVICE PERFORMANCE IMPROVEMENT DURING PANDEMIC COVID 19 USING INTEGRATED SERVQUAL AND SIX SIGMA: TELECOMMUNICATION AND INFORMATION INDUSTRY CASE APPLICATION. Journal of Industrial Engineering and Halal Industries, [S. l.], v. 1, n. 2, p. 94–101, 2020. DOI: 10.14421/jiehis.2198. Disponível em: https://ejournal.uin-suka.ac.id/saintek/JIEHIS/article/view/2198. Acesso em: 1 feb. 2025.