Concept formation tasks with five set Venn diagrams

Chehlarova, T., Chehlarova, K. (2024). Concept formation tasks with five set Venn diagrams. Journal “Mathematics and Informatics”. 67 (5), p. 535, ISSN: 1310–2230 (Print), 1314–8532 (Online), https://doi.org/10.53656/math2024-5-5-con