D. Kraus, M. Lorenz and V. E. Bondybey. On the dimers of the VIB group: a new NIR electronic state of Mo2. PhysChemComm. 2001, 4: 44 – 48. doi:10.1039/b104063b.
Gabriel Merino, Kelling J. Donald, Jason S. D’Acchioli, and Roald Hoffmann. The Many Ways To Have a Quintuple Bond. J. Am. Chem. Soc. 2007, 129 (49): 15295 –15302. doi:10.1021/ja075454b.