- Aminpour, T. 2008. Wood farming: opportunities and challenges. Proceedings of the Second National Congress on Poplar and Potential Use in Poplar Plantation. Published by Research Institute of Forests and Rangelands, 5-7 May, Vol. 2: 379-386 (In Persian).
- Assareh, M.H . 2008. Message of the president of the congress. Proceedings of the Second National Congress on Poplar and Potential Use in Poplar Plantation. Published by Research Institute of Forests and Rangelands, 5-7 May, Vol. 1: 13-14 (In Persian).
- Frohlich, H. 1973. Zuchtung, Anbau und Leistung der Papeln. Mitt. der Hess. Landesforstv. Band 10, 267p.
- Ghassemi, R. and Modirrahmati, A.R. 2003. Investigation on adaptability and wood production of different poplar clones (closed crown) in Karaj city. Iranian Journal of Forest and Poplar Research, 11(3): 359-390 (In Persian).
- Gholami, G.A., Modirrahmati, A.R. and Ghassemi, R. 2010. Some characteristics of poplar saplings (1/1) in experimental nurseries of Golestan province. Iranian Journal of Forest and Poplar Research, 18(2): 177-189 (In Persian).
- Hemmati, A. and Modirrahmati, A.R. 2003. Results of adaptation trial for high yielding poplar clones in Kermanshah`s Gharb paper industries. Iranian Forest and Poplar Research, 8: 59-86 (In Persian).
-Kelly, J.M. and Ericsson, T. 2003. Assessing the nutrition of juvenile hybrid poplar using a steady state technique and a mechanistic model. Forest Ecology and Management, 180(1): 249-260.
-Noori, F., Modirrahmati, A.R. and Hemmati, A. 2007. Survey of final adaptability of 10 closed crown poplar clones (Populus nigra) in Kermanshah province in order to introduce the best of them. Iranian Journal of Forest and Poplar Research, 14(4): 278-291 (In Persian).
- Salari, A. 1997. Investigation on adaptability of different Poplar clones in climate condition of Oroomiye. Final Report of Research Project, Published by Research Institute of Forests and Rangelands, 78p (In Persian).
-Wachter, H. 1988. Versuchsanbauten mit Schwarz Pappeln in Westfalen. Die Holzzucht, Nr. 1/2, Jahrg, 4: 15-20.
- Yousefi, B. and Modirrahmati, A.R. 2011. Survey on adaptation and wood yield of Populus nigra clones in comparative populetum of Sanandaj (final stage). Iranian Journal of Forest and Poplar Research, 19(3): 283-299 (In Persian).