@inproceedings{1047737,
    title = "For the demonstration of Pythagoras' theory of numbers: the formula of truth",
    author = "Constantopoulos, Charles (Constant)",
    year = "1957",
    pages = "191-197",
    publisher = "Γαλλικό Ινστιτούτο Αθηνών",
    booktitle = "First World Congress of Pythagorean Organizations: proceedings of the congress, Athens, Samos and Brussels, July-August 1955"
}