Schmidgen, Henning Department Experimental Systems and Spaces of Knowledge, Max Planck Institute for the History of Science, Max Planck Society;
Schmidgen, H. (2005). Repetition and differences: psychophysiological time machines, 1850-1865. In S. Zielinski, & S. M. Wagnermaier (Eds.), Variantology 1: on deep time relations of arts, sciences and technologies (pp. 145-158). Köln: Verlag der Buchhandlung Walther König.