1. Arana, A. (2016). Imagination in mathematics. In A. Kind (Ed.), The Routledge handbook of philosophy of imagination (pp. 463–477). Routledge.
2. Bussi, M. G. B., Taimina, D., & Isoda, M. (2010). Concrete models and dynamic instruments as early technology tools in classrooms at the dawn of ICMI: From Felix Klein to present applications in mathematics classrooms in different parts of the world. ZDM, 42(1), 19–31. https://doi.org/10.1007/s11858-009-0220-6.
3. Boi, L., Flament, D., & Salanskis, J. M. (Eds.) (1992). 1830–1930: A century of geometry: Epistemology, history and mathematics. Number 402 in lecture notes in physics. Berlin, Heidelberg: Springer. https://doi.org/10.1007/3-540-55408-4.
4. Born, M., & Born, H. (1969). In A. Hermann (Ed.), Der Luxus des Gewissens: Erlebnisse und Einsichten im Atomzeitalter. Nymphenburger Verlag, Munich.
5. Chislenko, E., & Tschinkel, Y. (2007). The Felix Klein Protocols. Notices of the American Mathematical Society, 54(8), 960–970. https://www.ams.org/journals/notices/200708/200708FullIssue.pdf.