Beckmann, A., Buss, S., Friedman, S., Müller, M., & Thapen, N. (2015). Cobham recursive set functions. Annals of Pure and Applied Logic, 167(3), pp. 335-369. doi:10.1016/j.apal.2015.12.005

Beckmann, Arnold, Sam Buss, Sy-David Friedman, Moritz Müller, and Neil Thapen. "Cobham Recursive Set Functions." Annals of Pure and Applied Logic 167, no. 3 (2015): 335-369.

Beckmann, Arnold, et al. "Cobham Recursive Set Functions." Annals of Pure and Applied Logic 167.3 (2015): 335-369.