Pawel Z, Markowski L, Opalach D. The level of entrepreneurship and the business cycle: A case study of Poland at the national and regional level. GJBEM [Internet]. 2021 Nov. 30 [cited 2024 Nov. 23];11(3):274-8. Available from: https://un-pub.eu/ojs/index.php/gjbem/article/view/5433