Pytel, Sławomir Piotr, and Iwona Kiniorska. “The Socioeconomic Status of Polish Pensioners Before and After Migration”. Acta Universitatis Lodziensis. Folia Oeconomica, vol. 5, no. 344, Sept. 2019, pp. 67-84, https://doi.org/10.18778/0208-6018.344.05.