@article{KleinpeterKochShainyan2008,
  author    = {Erich Kleinpeter and Andreas Koch and Bagrat A. Shainyan},
  title     = {Cyclobutadiene dianion derivatives : Planar 4c,6e or three-dimensional 6c,6e aromaticity?},
  doi       = {10.1016/j.theochem.2008.05.027},
  year      = {2008},
}