RUTKAUSKAS, Aleksandras Vytautas; VALIULIS, Donatas. With double trump portfolio through whirls of financial crisis. Business: Theory and Practice, [S. l.], v. 10, n. 4, p. 259–268, 2009. DOI: 10.3846/1648-0627.2009.10.259-268. Disponível em: https://journals.vilniustech.lt/index.php/BTP/article/view/8955. Acesso em: 11 may. 2025.