Edgerton. The Heritage of Giotto’s Geometry (1991). 108–147; Long. Power, Patronage and the Authorship of Ars (1997); Galluzzi. The Art of Invention (1999); Ackerman. Art and Science in the Drawings of Leonardo da Vinci (2002); Lefèvre. The Limits of Pictures (2003); Long. Picturing the Machine (2004).