système sexagésimal
1939 / Sketch of a History of the Sexagesimal System / F. Thureau-Dangin / Osiris 7 (1939) p. 95 [lien]
1965 / Eleven-Digit Regular Sexagesimals and Their Reciprocals / Owen Gingerich / Transactions of the American Philosophical Society 55 (1965) p. 3 [doi]
1965 / The sixty system of sumer / A. Seidenberg / Archive for history of exact sciences 2 (1965) p. 436 [doi]