S. P. G. K. N. B. J. R. P. N. Ravindran, K V Peter, “Isolation of protoplasts from cardamom (Elettaria cardamomum Maton.) and ginger (Zingiber officinale Rose.)”, J Spices Arom Crops, vol. 9, no. 1, pp. 23–30, Jun. 2000.