1. W. J. Adams, H. J. Geise, and L. S. Bartell, J. Am. Chem. Soc. 92, 5013 (1970).
2. K. Brendhaugen, M. Kolderup-Fikke, and H. M. Seip, Acta Chem. Scand. 27, 1101 (1993).
3. Structure of Free Polyatomic Molecules, Landolt-Bornstein, New Series, Ed. by K. Kuchitsu (Springer, Berlin, 1998), Vol. II/25A.
4. Structure of Free Polyatomic Molecules, Landolt-Bornstein, New Series, Ed. by K. Kuchitsu, N. Vogt, and M. Tanimoto (Springer, Berlin, 2007), Vol. II/28C.
5. S. Blanco, J. C. Lopez, A. Lesarri, and J. L. Alonso, J. Am. Chem. Soc. 128, 12111 (2006).