Vlad , M. D. . ., and S. . Vlad. “The Evolution of Intellectual Property Concepts at National and International Level ”. SCIENTIA MORALITAS - International Journal of Multidisciplinary Research , vol. 6, no. 1, July 2021, pp. 31-39, http://www.scientiamoralitas.com/index.php/sm/article/view/85.