https://www.mateinfo.ro/reviste-de-matematica/revista-electronica-de-matematica-mateinfo-ro-aparitie-lunara-2065-6432/revista-mateinfo-ro/revista-electronica-mateinfo-ro-2022/1314-revista-electronica-mateinfo-ro-iunie-2022/file
https://gaceta.rsme.es/abrir.php?id=1691
https://www.ssma.org/assets/docs/ProblemSolutionsSection/2022-ProblemSolutions/2022-05-Problems-Solutions-SSMJ-%23%23%23%205691-5696.pdf
