6,Caceres DD, Hancke JL, Burgos RA, et al. Prevention of common colds with Andrographis paniculata dried extract: a pilot double blind trial. Phytomedicine 1997;4:101-104.http://ac.els-cdn.com/S0944711397800517/1-s2.0-S0944711397800517-main.pdf?_tid=68e66788-5726-11e2-b89b-00000aab0f6b&acdnat=1357383505_f809c814b95ccf20be69d760625ab274
7.Spasov AA, Ostrovskij OV, Chernikov MV, et al. Comparative controlled study of Andrographis paniculata fixed combination, Kan Jang(R) and an echinacea preparation as adjuvant, in the treatment of uncomplicated respiratory disease in children. Phytother Res 2004;18:47-53. http://www.ncbi.nlm.nih.gov/pubmed/14750201