^Proanthocyanidin glycosides and related polyphenols from cacao liquor and their antioxidant effects. Tsutomu Hatano, Haruka Miyatake, Midori Natsume, Naomi Osakabe, Toshio Takizawa, Hideyuki Ito and Takashi Yoshida, Phytochemistry, April 2002, Volume 59, Issue 7, Pages 749–758, doi:10.1016/S0031-9422(02)00051-1
^Laplaze, L.; Gherbi, H.; Frutz, T.; Pawlowski, K.; Franche, C.; Macheix, J. J.; Auguy, F.; Bogusz, D.; Duhoux, E. Flavan-Containing Cells Delimit Frankia Infected Compartments in Casuarina glauca Nodules. Nitrogen Fixation: From Molecules to Crop Productivity. Current Plant Science and Biotechnology in Agriculture 38. 2002: 455. ISBN 0-7923-6233-0. doi:10.1007/0-306-47615-0_254.
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