Pholphana, N.; Rangkadilok, N.; Thongnest, S.; Ruchirawat, S.; Ruchirawat, M.; Satayavivad, J. Determination and Variation of Three Active Diterpenoids in Andrographis paniculata (Burm.f.) Nees. Phytochem. Anal. 2004, 15, 365–371.
Pholphana, N.; Rangkadilok, N.; Thongnest, S.; Ruchirawat, S.; Ruchirawat, M.; Satayavivad, J. Determination and Variation of Three Active Diterpenoids in Andrographis paniculata (Burm.f.) Nees. Phytochem. Anal. 2004, 15, 365–371.