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Zhao, Q., Huang, H-C., Nagaswamy, U., Xia, Y., Gao, X., Fox, G.E. (2012). «UNAC tetraloops: To what extent do they mimic GNRA tetraloops?». Biopolymers97 (8): 617-628. PMID22605553. doi:10.1002/bip.22049.
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ncbi.nlm.nih.gov
Cate, J.H., Gooding, A.R., Podell, E., Zhou, K., Golden, B.L., Kundrot, C.E., Cech, T.R., Doudna, J.A. (1996). «Crystal structure of a group I ribozyme domain: principles of RNA packing.». Science273 (5282): 1676-1685. PMID8781224. doi:10.1126/science.273.5282.1678.