dePamphilis, Claude W., Nelson D. Young, and Andrea D. Wolfe. "Evolution of plastid gene rps2 in a lineage of hemiparasitic and holoparasitic plants: Many losses of photosynthesis and complex patterns of rate variation." Proceedings of the National Academy of Sciences 94.14 (1997): 7367-7372. Web. 24 July. 2019.