Corporate social responsibility: an international study, the case of CGD (Portugal), Vale (Brazil), Technologica(Bulgaria) and Indian Oil (India) - Filipe, J. A.; Coelho, M. P.; Ferreira, M. A. M.; Selvarasu, A.; Figueredo, I. C.; Yordanova, D. (International Journal of Latest Trends in Finance and Economics Sciences, 2013)