VIAȘU, I. . “OPTIMUM LEVEL OF INVESTMENT IN EDUCATION: SOME LESSONS FROM AN ENDOGENOUS GROWTH MODEL”. Studia Universitatis Babeș-Bolyai Oeconomica, vol. 61, no. 1, Dec. 2016, pp. 24-33, http://193.231.18.162/index.php/subboeconomica/article/view/5169.