F. Arellano-Carbajal, I. Pacheco-Ruíz, and F. Correa-Díaz, “Seasonal variation in agar yield and quality of Gracilariopsis lemaneiformis (Bory) Dawson, Acleto et Foldvik, from the Gulf Of Califoria, Mexico”, Cienc. Mar., vol. 25, no. 1, pp. 51–62, Mar. 1999.