http://www.ncbi.nlm.nih.gov/pubmed/18316041 (Any fulltext)
http://ac.els-cdn.com/S0300908408000370/1-s2.0-S0300908408000370-main.pdf?_tid=3178dc64-6313-11e3-a5c3-00000aab0f6c&acdnat=1386842163_70087f845487a53311a49322b2c9d39e (Any fulltext)
Heckel, A., & Famulok, M. (2008). Building objects from nucleic acids for a nanometer world. Biochimie, 90(7), 1096-107. doi:10.1016/j.biochi.2008.02.004.