Aponte de Otaola, Nilda E., Manuel Díaz-Piferrer, and Horace D. Graham. “Seasonal Variations and Anatomical Distribution of Alginic Acid in Sargassum Spp. Found Along the Coasts of Puerto Rico”. The Journal of Agriculture of the University of Puerto Rico 67, no. 4 (October 1, 1983): 464–475. Accessed November 22, 2024. https://revistas.upr.edu/index.php/jaupr/article/view/7741.