Mayer, Andreas Department Ideals and Practices of Rationality, Max Planck Institute for the History of Science, Max Planck Society;
http://www.pep-web.org/document.php?id=aop.038.0071a (Supplementary material)
Mayer, A. (2015). Thinking in cases, picturing types: on the afterlife of Galton's composite photographs in psychoanalysis. Annual of Psychoanalysis, 38, 71-86.