Taveira M., Pereira D. M., Sousa C., Ferreres F., Andrade P. B., Martins A., Pereira J. A., and Valentão P.,  "In vitro cultures of Brassica oleracea L. var. costata DC: potential plant bioreactor for antioxidant phenolic compounds.",  Journal of Agricultural & Food Chemistry, vol. 57, pp. 1247-1252, 2009.