J. Ogweno Midiwo, N. Gikonyo, D. Wanjau, J. Matasi, and P. Waterman, “Flavonoids of <i>polygonum senegalense</i> (MEISN) part II: More surface and internal tissue flavonoid aglycones”, Bull. Chem. Soc. Eth., vol. 6, no. 2, Jul. 2012.