LESZCZYŃSKI, Jerzy. Two kinds of the positivity of law. Acta Universitatis Lodziensis. Folia Iuridica, Poland, v. 78, p. 43–53, 2017. DOI: 10.18778/0208-6069.78.04. Disponível em: https://www.czasopisma.uni.lodz.pl/Iuridica/article/view/1983. Acesso em: 8 aug. 2026.