Bock, R., Hagemann, R., Koessel, H., & Kudla, J. (1993). Tissue-Specific and Stage-Specific Modulation of Rna Editing of the Psbf and Psbl Transcript from Spinach Plastids - a New Regulatory Mechanism. Molecular & General Genetics, 240(2), 238-244. doi:10.1007/Bf00277062.