@article{Franck1994,
  author    = {Franck, Siegfried},
  title     = {Instability of a reaction zone at the Core-Mantle Boundary (CMB)},
  year      = {1994},
  language  = {en}
}
@article{FranckKowalle1994,
  author    = {Franck, Siegfried and Kowalle, Georg},
  title     = {Seismic velocity models for an internally asymmetric Mars},
  year      = {1994},
  language  = {en}
}