Avila, C. H., J. R. Aguirre, and E. Garcia. “Fir (Abies Hickelii Flous & Gaussen) Forest Structure Variation in Relation to Environmental Factor on the Orizaba Peak, Mexico”. Forest Systems 3, no. 1 (June 1, 1994): 5-17. Accessed April 28, 2024. https://fs.revistas.csic.es/index.php/fs/article/view/516.