Ulman, P., A. Wałęga, and G. Wałęga. “Is Health Status a Determinant of The Economic Activity? Some Evidence From Poland”. Acta Universitatis Lodziensis. Folia Oeconomica, vol. 2, no. 328, Sept. 2017, p. [39]-54, doi:10.18778/0208-6018.328.03.