SZEREDA, Kamil; SZYMAŃSKA, Jolanta. Optimization of social security contributions in health care. Polish Journal of Public Health, Lublin, Poland, v. 126, n. 4, p. 151–154, 2017. DOI: 10.1515/pjph-2016-0031. Disponível em: https://czasopisma.umlub.pl/pjph/article/view/1268. Acesso em: 28 aug. 2025.