https://is.muni.cz/th/gcnk0/Bakalarska_prace_-_Jirak.pdf
Pictures were obtained from: https://www.craiyon.com/
a book : Les jeux Olympiques - Questions/Réponses - doc dès 7 ans
https://fr.wikipedia.org/
www.ime.gr/olympics/
www.theguardian.com/sport/series/50-stunning-olympic-moments