KOPEVA, Diana; BLAGOEV, Dimitar; SHTEREV, Nikolay. Industrial growth, investment behavior and innovations in Bulgaria. REGIONAL AND BUSINESS STUDIES, [S. l.], v. 3, n. 1 Suppl., p. 683–697, 2011. Disponível em: https://journal.uni-mate.hu/index.php/rbs/article/view/520. Acesso em: 10 apr. 2025.