1. Chen SJ, Dill KA (2000) RNA folding energy landscapes. Proc Nat Acad Sci 97(2):646–651
2. Flamm C, Fontana W, Hofacker IL, Schuster P (2000) RNA folding at elementary step resolution. RNA 6:325–338
3. Flamm C, Hofacker IL, Stadler PF, Wolfinger MT (2002) Barrier trees of degenerate landscapes. Zeitschrift für Physikalische Chemie 216:155–174
4. Garey MR, Johnson DS (1979) Computers and Intractability: a guide to the theory of NP-completeness. W. H. Freeman & Co., New York, NY, USA
5. Graham R, Knuth D, Patashnik O (1989) Concrete mathematics: a foundation for computer science. Addison-Wesley, Reading, MA, USA