Source: http://web.a9lame.com/Documents/Lyc%C3%A9e/Bac%20FR/b-1er%20Bac%20International/a-1er%20Bac%20Sciences%20Math%C3%A9matiques/b-Physique/a-Semestre%20I/a-Rotation%20dun%20solide%20ind%C3%A9formable%20autour%20d