Paranagama, P.A.Ekanayake, E.M.K.S.2014-11-192014-11-192000Paranagama, P.A.and Ekanayake, E.M.D.S. (2000): Repellent activity of Alpinia calcarata volatiles for Periplanata americana (American cockroaches), 10th Asian Symposium on Medicinal Plants, Spices and other Natural Products, Dhaka, Bangaladesh, November 2000,pp115.http://repository.kln.ac.lk/handle/123456789/3862Repellant Activity of Alpinia calcarata Volatiles for Periplanata americana (American Cockroaches)articleChemistry