SKRZYPEK, Mariusz; SZYMAŃSKA, Jolanta; BUCZEK, Bartłomiej. The complexity of the process of service purchase planning by the National Health Fund. Polish Journal of Public Health, Lublin, Poland, v. 122, n. 4, p. 426–429, 2012. DOI: 10.12923/j.0044-2011/122-4/a.17. Disponível em: https://czasopisma.umlub.pl/pjph/article/view/2016. Acesso em: 31 aug. 2025.