Johansen S, Einvik C, Nielsen H (September 2002). "DiGIR1 and NaGIR1: naturally occurring group I-like ribozymes with unique core organization and evolved biological role". Biochimie. 84 (9): 905–12. doi:10.1016/S0300-9084(02)01443-8. PMID12458083.
Johansen S, Vogt VM (February 1994). "An intron in the nuclear ribosomal DNA of Didymium iridis codes for a group I ribozyme and a novel ribozyme that cooperate in self-splicing". Cell. 76 (4): 725–34. doi:10.1016/0092-8674(94)90511-8. PMID8124711. S2CID45868519.
Meyer, Mélanie; Masquida, Benoît (2014), Waldsich, Christina (ed.), "Cis-Acting 5' Hammerhead Ribozyme Optimization for in Vitro Transcription of Highly Structured RNAs", RNA Folding: Methods and Protocols, Methods in Molecular Biology, vol. 1086, Humana Press, pp. 21–40, doi:10.1007/978-1-62703-667-2_2, ISBN978-1-62703-667-2, PMID24136596
Johansen S, Einvik C, Nielsen H (September 2002). "DiGIR1 and NaGIR1: naturally occurring group I-like ribozymes with unique core organization and evolved biological role". Biochimie. 84 (9): 905–12. doi:10.1016/S0300-9084(02)01443-8. PMID12458083.
Johansen S, Vogt VM (February 1994). "An intron in the nuclear ribosomal DNA of Didymium iridis codes for a group I ribozyme and a novel ribozyme that cooperate in self-splicing". Cell. 76 (4): 725–34. doi:10.1016/0092-8674(94)90511-8. PMID8124711. S2CID45868519.
Meyer, Mélanie; Masquida, Benoît (2014), Waldsich, Christina (ed.), "Cis-Acting 5' Hammerhead Ribozyme Optimization for in Vitro Transcription of Highly Structured RNAs", RNA Folding: Methods and Protocols, Methods in Molecular Biology, vol. 1086, Humana Press, pp. 21–40, doi:10.1007/978-1-62703-667-2_2, ISBN978-1-62703-667-2, PMID24136596
Johansen S, Vogt VM (February 1994). "An intron in the nuclear ribosomal DNA of Didymium iridis codes for a group I ribozyme and a novel ribozyme that cooperate in self-splicing". Cell. 76 (4): 725–34. doi:10.1016/0092-8674(94)90511-8. PMID8124711. S2CID45868519.