Drude, I., Strahl, A., Galla, D., Müller, O., & Müller, S. (2011). Design of hairpin ribozyme variants with improved activity for poorly processed substrates. FEBS Journal, 278(4): 1, pp. 622-633. Retrieved from http://dx.doi.org/10.1111/j.1742-4658.2010.07983.x.