https://academic.oup.com/bioinformatics/article/22/14/1723/227337 (Publisher version)
Tabei, Y., Tsuda, K., Kin, T., & Asai, K. (2006). SCARNA: Fast and Accurate Structural Alignment of RNA Sequences by Matching Fixed-Length Stem Fragments. Bioinformatics, 22(14), 1723-1729. doi:10.1093/bioinformatics/btl177.