Nir Keren, Berg, Alexander , Van Kan, Paul JM , Levanon, Haim , and Ohad, Itzhak . 1997. “Mechanism Of Photosystem Ii Photoinactivation And D1 Protein Degradation At Low Light: The Role Of Back Electron Flow”. Proceedings Of The National Academy Of Sciences, 94, 4, Pp. 1579–1584.