Composition #5: Ossipov, V., Loponen, J., Ossipova, S., Haukioja, E., Pihlaja, K. Gallotannins of birch Betula pubescens leaves: HPLC separation and quantification . biochemical systematics and ecology, 1997, vol. 25, no. 6, p. 493–504. DOI: 10.1016/S0305-1978(97)00032-X.
[
DOI link]