Peña-Manjarrez, JL, et al. “Environmental Factors Influencing the Variability of Lingulodinium Polyedrum and Scrippsiella Trochoidea (Dinophyceae) Cyst Production”. Ciencias Marinas, vol. 35, no. 1, Mar. 2009, pp. 1–14, doi:10.7773/cm.v35i1.1406.