rule for the area of a triangle and an incorrect rule for the volume of a pyramid. (He claimed that the volume was half the height times the area of the
[2020-05-18]. (原始内容存档于2013-01-29) (意大利语). Wilson, Jonathan. Inverting The Pyramid: The History of Soccer Tactics. London: Orion. 2009: 159–65 [2020-05-25]