@article{RengelAltmannNeheretal.1999,
  author    = {Heiko Rengel and Markus Altmann and Dieter Neher and Craig B. Harrison and Michael L. Myrick and Uwe H. F. Bunz},
  title     = {Assignment of the optical transitions in 1,3- diethynylcyclobutadiene (cyclopentadienyl)cobalt oligomers},
  year      = {1999},
}