JEWANSKI, Jörg, DAY, Sean A., SIMNER, Julia and WARD, Jamie. The beginnings of an interdisciplinary study of synaesthesia: Discussions about the Nussbaumer brothers (1873). Theoria et Historia Scientiarum. Online. 20 May 2014. Vol. 10, pp. 149-176. [Accessed 6 July 2025]. DOI 10.12775/ths-2013-0008.