I. L. Hofacker; W. Fontana; P. F. Stadler; L. S. Bonhoeffer; M. Tacke; P. Schuster (1994). "Fast folding and comparison of RNA secondary structures". Monatshefte für Chemie. 125 (2): 167–188. doi:10.1007/BF00818163. S2CID19344304.
Bailey TL, Elkan C (1994). "Fitting a mixture model by expectation maximization to discover motifs in biopolymers". Proceedings. International Conference on Intelligent Systems for Molecular Biology. 2: 28–36. PMID7584402.
I. L. Hofacker; W. Fontana; P. F. Stadler; L. S. Bonhoeffer; M. Tacke; P. Schuster (1994). "Fast folding and comparison of RNA secondary structures". Monatshefte für Chemie. 125 (2): 167–188. doi:10.1007/BF00818163. S2CID19344304.