9Jos é A Fern á ndez-L ó pez,Luis Almela.Application of high-performance liquid chromatography to the characterization of the betalainpigments in prickly pear fruits[J].Journal of Chromatography A,2001,913:415-420.
10Willibald Schliemanna,Yizhong Cai.Betalains of celosia argentea[J].Phytochemistry,2001,58:159-165.
