Cichowska J, Mreła A, Zawadka J. Analysis of demand for qualified tourism organized by branches of the Polish Tourist and Sightseeing Society (using fuzzy relations). TRR [Internet]. 15 czerwiec 2024 [cytowane 21 listopad 2024];(21):19-2. Dostępne na: https://tirr.sggw.edu.pl/article/view/9864