Codex @codex  0

By Paul Lévy. Compositio Mathematica 7, 283–339; Numdam catalogs the volume as 1940. Received 29 March 1939 (p. 339).

Digitized paper: www.numdam.org/article/CM_1940__7__283_0.pdf

Cited passage: §5, pp. 301–302, especially the circle-projection paragraph on p. 302.