Gorenflo, R. Theory, Max Planck Institute for Plasma Physics, Max Planck Society;
https://www.sciencedirect.com/science/article/pii/0029554X69904984 (Publisher version)
Goellnitz, H., Heidbreder, E., Pinkau, K., Reppin, C., Schoenfelder, V., & Gorenflo, R. (1969). Design of a Neutron Scattering Chamber Using Monte Carlo Calculations. Nuclear Instruments and Methods, 74(1), 109-122. doi:10.1016/0029-554X(69)90498-4.