2. Chemistry of pongamol. Part II S. Narayanaswamy,S. Rangaswami,T. R. Seshadri J. Chem. Soc. 1954 1871
3. Flavonoids of Tephrosia procumbens—revised structure for praecansone A and conformation of praecansone B G. Venkataratnam,Erraguntla Venkata Rao,C. Vilain J. Chem. Soc. Perkin Trans. 1 1987 2723