Kubiciel-Lodzińska, Sabina, and Bogdan Ruszczak. 2019. “Labor Market Segmentation As an Important Factor in Research of Labor Immigration. Comparative Analysis Based on the Opolskie Voivodship Empirical Findings”. Regional Barometer. Analyses & Prognoses 16 (4):61-67. https://doi.org/10.56583/br.46.