@article{KuehnScherbaumRiggelsen2009,
  author    = {Nicolas M. K{\"u}hn and Frank Scherbaum and Carsten Riggelsen},
  title     = {Deriving empirical ground-motion models : balancing data constraints and physical assumptions to optimize prediction capability},
  doi       = {10.1785/0120080136},
  url       = {http://bssa.geoscienceworld.org/},
  year      = {2009},
}