VAKALO, E.-G. G.; PLESSAS, D. J. A conceptual framework for the estimation of opportunity loss at the regional-sectoral level with an application to Greece. The Greek Review of Social Research, [S. l.], v. 32, p. 117–126, 1978. DOI: 10.12681/grsr.451. Disponível em: https://ejournals.epublishing.ekt.gr/index.php/ekke/article/view/7069. Acesso em: 6 may. 2024.