1. Fritsch F E (1935). The structure and reproduction of the algae. London: Cambridge University Press
2. Fu H L, Chen H, Dong B, Qin RW (2001a). The effects of heavy metal ions on the chlorophyll content and cell membrane permeability of Charophytes. Journal of Sichuan University (Natural Science Edition), 38: 757–764 (in Chinese)
3. Fu H L, Qin J, Chen H (2001b). Study on Charophytes ability to purify and accumulate the heavy metal ions. Journal of Sichuan University (Natural Science Edition), 38: 263–268 (in Chinese)
4. Groves H, Bullock-Webster G R (1924). The British Charophyta. Chareae. London: The Ray Society
5. Han F S, Li RY (1994). Flora algarum sinicarum aquae dulcis (Tomus 3, Charophyta). Beijing: Science Press (in Chinese)