Simple and Fast Picomolar Detection of Ochratoxin A Using a Reusable Label Free Aptasensor Built with a Layer-by-layer Procedure. - Simão, Estéfani P.; Cao‐Milán, Roberto; Costa‐Pedro, Graciela; De Melo, Celso P.; Cao, Roberto; Oliveira, Maria D. L.; Andrade, Cesar A. S. (Electroanalysis, 2017)