1. Bisoffi S and U Gullberg (1996) Poplar breeding and selection strategies. In: Stettler RF, HD Bradshaw Jr, PE Heilman and TM Hinckley (eds) Biology of Populus and its implications for management and conservation. Ottawa, ON, Canada: NRC Research Press, National Research Council of Canada, pp 139- 158, ISBN 0-660-16506-6
2. Comstock RE and RH Moll (1963) Genotype - environment interactions. In: Hanson WD and HF Robinson (eds) Statistical genetics and plant breeding. Publication 982. Washington, DC, USA: National Academy of Sciences, National Research Council, pp 164-196
3. Eckenwalder JE (1996) Systematics and evolution of Populus. In: Stettler RF, HD Bradshaw Jr, PE Heilman and TM Hinckley (eds) Biology of Populus and its implications for management and conservation. Ottawa, ON, Canada: NRC Research Press, National Research Council of Canada, pp 7-32, ISBN 0-660- 16506-6
4. Foster GS and DV Shaw (1988) Using clonal replicates to explore genetic variation in a perennial plant species. Theoretical and Applied Genetics 76:788- 794. https://doi.org/10.1007/BF00303527 10.1007/BF00303527
5. Hansen EA, ME Ostry, WD Johnson, DN Tolsted, DA Netzer, WE Berguson and RB Hall (1994) Field performance of Populus in short-rotation intensive culture plantations in the north-central U.S. Research Paper NC-320. St. Paul, MN, USA: U.S. Department of Agriculture, Forest Service, North Central Forest Experiment Station, 13 p. https://doi.org/10.2737/nc-rp-320 10.2737/NC-RP-320