The Cambridge Cluster Database
These results are from the following publications: N = 16-18 and 22, S. Yoo and X.C. Zeng, Angew. Chem. Int. Ed., 44, 1491 (2005); N = 25, S. Yoo, X.C. Zeng, X. Zhu, and J. Bai, J. Am. Chem. Soc., 125, 13318 (2003); N = 27-39, S. Yoo, J.J. Zhao, J.L. Wang, and X.C. Zeng, J. Am. Chem. Soc., 126, 13845 (2004).