. Spies, T.A., and Franklin, J.F. (1996). The Diversity and Maintaince of Old-growth Forest. Oxford University Press, New York, 778 p.
. Spies, T.A. (2004). Ecological concepts and diversity of old-growth forests. Journal of Forestry, 102: 14-20.
. Ali-Ahmad Korori, S., Shirvany, A., Khoshnevis, M., Matinzadeh, M., Imani, G., Shabestani, SH., and Valipour Kahrud, H. (2011). Long Lived Trees of Yazd Province. Niak Press, 188 p.
. Marvie Mohadjer, M.R. (2011). Silviculture, University of Tehran, Tehran Press, 418 p.
. Azaryan, M. (2013). Relationship between silvicultural characteristics of long-lived trees and site factors in Kheyrud Forest. MSc. thesis, Department of Forestry and Forest Economics, University of Tehran, Karaj, 145 p.
. Khorasani, N.A., Marvie Mohadjer, M.R., and Kohandel, A. (2004). Old Trees. Green Space Symposium, Tehran Parks & Green Space Organization, 14-19.
. Parish, R., and Antos, J.A. (2006). Slow growth, long-lived trees, and minimal disturbance characterize the dynamic of an ancient, montane forest in coastal British Columbia. Forest Research, 36: 2826-2838.
. Woods, K.D. (2000). Dynamics in late-successional hemlock-hardwood forests over the three decades. Ecology, 81: 110-126.
. Henbo, Y., Itaya, A., Nishimura, N., and Yamamoto, S.I. (2004). Long-term canopy dynamics in a large area of temperate old-growth beech (Fagus crenata) forest: analysis by aerial photographs and digital elevation models. Journal of Ecology, 92: 945-953.
. Luyssaert, S., Schulz, E.D., Börner, A., Knohl, A., Hessenmöllen, D., Law, B.E., Ciais, P., and Grace, J. (2008). Old-growth forests as global carbon sinks. Nature, 455: 213-215.
. Parviainen, J. (2005). Virgin and natural forests in the temperate zone of Europe. Swiss Federal Institute for Forest. Snow and Landscape, 79: 9-18.
. Kucbel, S., Saniga, M., Jaloviar, P., and Vencurik, J. (2012). Stand structure and temporal variability in old-growth beech-dominated forests of the northwestern Carpathians: A 40-years perspective. Forest Ecology and Management, 264: 125-133.
. Sefidi, K. (2012). Late succesional stage dynamics in natural oriental beech (Fagus orientalis Lipsky.) stands, Northern Iran. PhD Thesis, Department of Forestry and Forest Economics, University of Tehran, Karaj, 150 p.
. Moradi, M., Marvie Mohadjer, M.R., Zobeiri, M., and Omidi, A. (2010). Morphological characteristics and health of beech trees by diameter more than one meter (case study, Guilan province). Iranian Journal of Forest and Poplar Research, 18(1): 46-58.
. Weisberg, P.J., and Ko, D.W. (2012). Old tree morphology in singleleaf pinyon pine (Pinus monophylla). Forest Ecology and Management, 263: 67-73.
. Ludwig, J.A., and Reynolds, F.J. (1988). Statistical Ecology: A Primer in Methods and Computing. John Wiley and Sons, 337 p.
. Moradi, M. (2008). Morphological characteristics and health of beech trees by diameter more than one meter in Hyrcanian Forest (case study, Guilan province). MSc. Thesis, Department of Forestry and Forest Economics, University of Tehran, Karaj, 60 p.
. Marvie Mohadjer, M.R. (1976). Evaluation of qualitative characteristics of Fagetum stands, Northern Iran. Journal of Faculty of Natural Resources, 34: 77-96.
. Akhavan, R., and Namiranian, M. (2007). Slenderness coefficient of five major tree species in the Hyrcanian forest of Iran. Iranian Journal of Forest and Poplar Research, 15(2): 165-180.
. Ranius, T., Niklasson, M., and Berg, N. (2009). Development of tree hollows in pedunculate oak (Quercus robur). Forest Ecology and Management, 257: 303-310.