Melkozernov, A. N., Lin, S., Blankenship, R. E., Valkunas, L., Spectral inhomogeneity of photosystem I and its influence on excitation equillibration and trapping in the cyanobacterium, Synechocystis sp. PCC6803 at 77 K. Biophys. J., 80, 1144-1154 2001