The Set's Game-Play of Sets is based on a series of lectures given by Kostas Axelos in various European universities between 1967 and 1970, and is penned under the title Le Jeu de l'Ensemble des Ensembles in 1970.
Axelos' article has two different translations in English. This is the translation by Beverly Livingstone. For more information, follow this link to the other translation of the article.
You can find below both versions.