“…The two-parameter Weibull function has therefore been reported to be the most simple and accurate for modelling diameter distributions for several tree species worldwide, such as birch (Betula alba) stands in northwestern Spain (Gorgoso, 2003;Gorgoso, Alvarez-Gonzalez, Rojo, & Grandas-Arias, 2007), sitka spruce (Picea sitchensis) and other conifer species in Great Britain (Rennolls, Geary, & Rollinson, 1985), Scots Pine (Pinus sylvestris) and Norway Spruce (Picea abies) stands in Finland (Maltamo, Puumalainen, & Paivinen, 1995), Maritime Pine (Pinus pinaster) in Spain ( Alvarez-Gonz alez, 1997), Common Birch (Betula alba) in northwestern Spain (Gorgoso, 2003;Gorgoso et al, 2007), Loblolly Pine (Pinus taeda) in USA (Bullock & Burkhart, 2005), the eight most common tree species of Catalonia in Spain (P. sylvestris, Pinus uncinata, Pinus pinea, Pinus halepensis, Pinus nigra, Abies alba, Quercus ilex, and Quercus suber) (Palahí, Pukkala, & Trasobares, 2006), Austrian Black Pine (P. nigra) in Bulgaria (Stankova & Zlatanov, 2010), and Cork Oak (Q. suber L.) in Spain (Calzado-Carretero & Torres-Alvarez, 2013).…”