LACH , Bartłomiej. Measuring Investment Funds Efficiency Using Data Envelopment Analysis. Studia Oeconomica Posnaniensia, Poznan, Polska, v. 4, n. 6, p. 57–77, 2016. DOI: 10.18559/SOEP.2016.6.3. Disponível em: https://journals.ue.poznan.pl/soep/article/view/3460. Acesso em: 3 sep. 2026.