THE DEVELOPMENT OF REFERENCE MATERIALS FOR PARALYTIC SHELFISH POISONING TOXINS IN LYOPHIZED MUSSEL. I: INTERLABORATORY STUDIES OF METHODS OF ANALYSIS

VAN DEN TOP, HP., BOENKE, A., BURDASPAL, P.A., BUSTOS, J., VAN EGMOND, LEGARDA, T., MESEGO, A. MOURIÑO, A., PAULSCH, W.E., SALGADO, C