@article{KauppSchleyerDolgetal.1992,
  author    = {Martin Kaupp and Paul von Rague Schleyer and Michael Dolg and Hermann Stoll},
  title     = {The Equilibrium Structures of Monomeric Group 2 and Lanthanide(II) Metallocenes MCp2 (M = Ca, Sr, Ba, Sm, Eu, Yb) Studied by ab Initio Calculations},
  year      = {1992},
}