1.
Rząsa K, Ciski M. Determination of the level of sustainable development of the cities - a proposal for a method of classifying objects based on natural breaks. ASPAL [Internet]. 2021 Oct. 4 [cited 2024 Nov. 21];20(3):215-39. Available from: https://czasopisma.uwm.edu.pl/index.php/aspal/article/view/6701