J. J. Gorgoso-Varela and A. Rojo-Alboreca, “A comparison of estimation methods for fitting Weibull and Johnson’s SB functions to pedunculate oak (Quercus robur) and birch (Betula pubescens) stands in northwest Spain”, For. syst., vol. 23, no. 3, pp. 500-505, Dec. 2014.