Erbacher, C. E. and Österman, B. (2014) “A Passport Photo of Two: On an Allusion in the Pictures of Wittgenstein and von Wright in Cambridge”, Nordic Wittgenstein Review, 3(1), pp. 139–149. Available at: https://www.nordicwittgensteinreview.com/article/view/1948 (Accessed: 22 February 2025).