Biernat-Jarka, Agnieszka, and Ewa Grzymska. 2010. “BARRIERS OF ENTERPRISES’ INNOVATIVENESS INCREASE IN POLAND ON THE EXAMPLE OF THE SME SECTOR”. Acta Scientiarum Polonorum. Oeconomia 9 (1), 23-28. https://js.wne.sggw.pl/index.php/aspe/article/view/3866.