Saint-Vincent wrote about them privately in 1625 and published his work in 1647, while Cavalieri published his in 1635 with a corrected version appearing in 1653.
Saint-Vincent vaino escribir en privado en 1625 e vai publicar o seu traballo en 1647, mentres que Cavalieri publica o seu en 1635, cunha versión corrixida que publica en 1653.