@article{KauppSchleyerStolletal.1991,
  author    = {Martin Kaupp and P. v. R. Schleyer and H. Stoll and H. Preuss},
  title     = {Pseudopotential Approaches to Ca, Sr and Ba Hybrides. Why are some Alkaline Earth MX\(_2\) Compounds Bent?},
  year      = {1991},
}