Bock, R., Hermann, M., & Fuchs, M. (1997). Identification of Critical Nucleotide
Positions for Plastid Rna Editing Site Recognition. Rna-a Publication of the RNA Society,
3(10), 1194-1200. Retrieved from http://www.ncbi.nlm.nih.gov/pubmed/9326494 http://rnajournal.cshlp.org/content/3/10/1194.full.pdf.