Ponce, D. B., P. J. Donoso, and C. Salas-Eljatib. “Old-Growth Index: A Tool to Evaluate Developmental Stages in Native Forests in the Lowlands of South-Central Chile”. Revista Bosque, vol. 40, no. 2, Aug. 2019, pp. 235-40, https://revistabosque.org/index.php/bosque/article/view/737.