8Caind, K. M. Spectrophotometric-Estimation of Andrographolide in Kalmegh [J]. Indian J. Pharm, 1963, (25):225 -226.
9ZhaoJ, YangG, LiuH. Determination of andrographolide,deoxyandrographolide and neoandrographolide in the Chinese herb Andrographis paniculata by micellar electrokinetic capillary chromatgraphy [J]. Phytochem Anal,2002, Jul-Aug; 13 (4) :222 - 7.
10Cheung HY, Cheung CS, Kong CK. Determination of bioactive diterpenoids from Andrographis paniculata by micellar electrokinetic chromatography [J]. J Chromatogr A,2001 ,Sep 28;930(1 -2) :171 -6.