Mazurkiewicz, Adam, Jerzy Dobrodziej, and Rozalia Sitkowska. “Innovative Activity And Change Tendencies Of Some Of Polish Industry’s Economic Indicators”. Journal of Business & Economics Research (JBER) 2, no. 6 (June 1, 2004). Accessed July 17, 2024. https://clutejournals.com/index.php/JBER/article/view/2887.