HAJDUK, Sławomira. Efficiency evaluation of urban transport using the DEA method. Equilibrium. Quarterly Journal of Economics and Economic Policy, Olsztyn, v. 13, n. 1, p. 141–157, 2018. DOI: 10.24136/eq.2018.008. Disponível em: https://economic-policy.pl/index.php/eq/article/view/729. Acesso em: 21 jan. 2026.