Aguirre, A., Cañellas, I., Adame, P., Moreno-Fernández, D., Condés, S. and Alberdi, I. 2026. Refining current annual volume increment estimation for forest tree species in Spain. Forest Systems. 34, 3 (Jan. 2026), 21004. DOI:https://doi.org/10.5424/fs/2025343-21004.