Łukowski, Łukasz and Żukowski, B. 2014. Principles of so-called „material” and „formal” truth. A logical, philosophical and juridical analysis. Acta Universitatis Lodziensis. Folia Iuridica. 73 (Jan. 2014), 49–61. DOI:https://doi.org/10.18778/0208-6069.73.04.