Paul M. Keller Keller, P. M., & Turinsky, P. J. (2001). FORMOSA-P three-dimensional/two-dimensional geometry collapse methodology. NUCLEAR SCIENCE AND ENGINEERING, 139(3), 235–247. https://doi.org/10.13182/NSE01-A2234 Keller, P. M., & Lee, J. C. (1998). A time-dependent collision probability method for one-dimensional space-time nuclear reactor kinetics. NUCLEAR SCIENCE AND ENGINEERING, 129(2), 124–148. https://doi.org/10.13182/NSE98-A1968