FILIPOWICZ, Katarzyna. Simulation of Trajectories of Labour Productivity in Polish Regions; Analysis Based on Gravity Model of Economic Growth. DEMO, Cracow, v. 2, n. 2, p. 96–117, 2017. Disponível em: https://ojs.fimagis.pl/index.php/demo/article/view/1095. Acesso em: 22 apr. 2026.