Matiullah, Amjad ur Rahman, Zahid Ullah, Aamir Saleem, Rahmatullah Qureshi, David F.R.P. Burslem, and Z.- ur-R. Mashwani. “Distribution Pattern of Tree Species and Richness Along an Altitude Gradient in the Sub-Alpine Temperate Zone of Hindu Kush Mountainous Forests, Pakistan: Tree Species Richness Along Elevation Gradient”. Proceedings of the Pakistan Academy of Sciences: B. Life and Environmental Sciences, vol. 59, no. 4, Dec. 2022, pp. 81-92, doi:10.53560/PPASB(59-4)741.