Spalter, R. A., Walsh, D., Reeves, R. A., Saul, D. J., Gray, R. D., Bergquist, P. L., et al. (1997).
Sequence heterogeneity of the ribosomal RNA intergenic region Alexandrium species. Biochemical Systematics
and Ecology, 25(3), 231-239. doi:10.1016/S0305-1978(96)00111-1.