VIRUIŠIS, Vaclovas. Problematic textual sums on economics. Lietuvos matematikos rinkinys, [S. l.], v. 42, n. spec., p. 457–458, 2002. DOI: 10.15388/LMR.2002.32976. Disponível em: https://www.journals.vu.lt/LMR/article/view/32976.. Acesso em: 19 may. 2024.