María Gabriel y Galán, J., Prada, C., H. Rolleri, C., Lahoz-Beltrá, R., & Martínez-Calvo, C. (2011). Biometry of stomata in Blechnum species (Blechnaceae) with some taxonomic and ecological implications for the ferns. Universidad de Costa Rica.

María Gabriel y Galán, José, Carmen Prada, Cristina H. Rolleri, Rafael Lahoz-Beltrá, and Cristina Martínez-Calvo. Biometry of Stomata in Blechnum Species (Blechnaceae) With Some Taxonomic and Ecological Implications for the Ferns. Universidad de Costa Rica, 2011.

María Gabriel y Galán, José, et al. Biometry of Stomata in Blechnum Species (Blechnaceae) With Some Taxonomic and Ecological Implications for the Ferns. Universidad de Costa Rica, 2011.