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Botrytis); (ii) broccoli ( brassica oleracea var. italica); (iii) round cabbage ( brassica oleracea var. capitata) and (iv) Brussels sprout ( brassica oleracea var. gemmifera), by means of electrical impedance spectroscopy and fractional calculus tools. Experimental data is approximated using fractional-order models and the corresponding parameters are determined with a genetic algorithm. 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