If you use RNAwolf, MC-Fold-DP, or SSPcompare, please cite Höner zu Siederdissen et al. (2011) .
For MC-Fold-DP please cite Parisien and Major (2008) as well, as you are using their database.
Höner zu Siederdissen, Christian, Stephan H. Bernhart, Peter F. Stadler, and Ivo L. Hofacker. 2011. A Folding Algorithm for Extended RNA Secondary Structures. Bioinformatics 27: 129–36. doi:10.1093/bioinformatics/btr220.
Parisien, Marc, and Francois Major. 2008. The MC-Fold and MC-Sym pipeline infers RNA structure from sequence data. Nature 452: 51–55. doi:10.1038/nature06684.