J. W. dos Santos, O. L. S. de Alsina, and L. F. Monteiro, “Validity and reliability analysis of the Servqual model adapted to supermarket retail”, Braz. J. Prod. Eng., vol. 6, no. 7, pp. 120–132, Dec. 2020, doi: 10.47456/bjpe.v6i7.33532.