Butrón, A., E. Orive, and I. Madariaga. 2011. Potential risk
Butrón, A., E. Orive, and I. Madariaga. 2011. Potential risk of harmful algae transport by ballast waters: the case of Bilbao Harbour. Mar. Pollut. Bull. 62: 747-757. [discusses Pseudo-nitzschia species]