1.
KALINOWSKI, Marek. Making the performance complied with the principles of community law and the natural obligation. Some remarks from the historical point of view. Studia Iuridica Toruniensia. Online. 18 March 2017. Vol. 19, pp. 77-92. [Accessed 27 April 2024]. DOI 10.12775/SIT.2016.016.