8Gujral V K, Gupta S R, Verma K S. Structure of Undulatoside-B, a New Chromone Glycoside from Tecomella undulata[J]. Indian J Chem B, 1979, 17.. 40--41.
9Fumiko Abe, Tatsuo Yamauchi. Megastigmanes and Flavonoids from the leaves of Scorodocarpus Borneensis[J]. Phytochemistry, 1993, 33 (6): 1499--1501.
10Shibnath Ghosal, Shripati Singh, Mahendra P Bhagat, et al. Three Chromones from Bulbs of Pancratium Biflorum[J]. Phytochemistry, 1982, 21(12):2943--2946.