CITES non-detriment findings guidance for perennial plants A nine-step process to support CITES scientific, authorities making science-based non-detriment findings (NDFs) for species listed in CITES Appendix II, Version 3.0 - Wolf, Daniel; Oldfield, Thomasina; Schippmann, Uwe; McGough, Noel; Leaman, Danna J. (BfN-Skripten, 2016)