Karbowski, A., and J. Prokop. “THE IMPACT OF PATENTS AND R&D COOPERATION ON R&D INVESTMENTS IN A DIFFERENTIATED GOODS INDUSTRY”. The South East European Journal of Economics and Business, Vol. 15, no. 1, May 2020, pp. 122-33, https://journal.efsa.unsa.ba/index.php/see/article/view/1193.