Serganov, A., Keiper, S., Malinina, L., Tereshko, V., Skripkin, E., Hoebartner, C., Polonskaia, A., Phan, A. T., Wombacher,
R., Micura, R., Dauter, Z., Jaeschke, A., & Patel, D. J. (2005). Structural basis
for Diels-Alder ribozyme-catalyzed carbon-carbon bond formation. Nature Structure & Molecular
Biology, 12(3), 218-224. Retrieved from http://www.nature.com/nsmb/journal/v12/n3/full/nsmb906.html.