@article{RajewskyHantkeMuth2014,
  author    = {Boris Rajewsky and Hans-J{\"u}rgen Hantke and Hermann Muth},
  title     = {Altersabh{\"a}ngigkeit des nat{\"u}rlichen Radium-Gehalts},
  journal   = {Zeitschrift f{\"u}r Naturforschung, A},
  volume    = {13},
  number    = {7},
  pages     = {474 -- 475},
  doi       = {10.1515/znb-1958-0725},
  year      = {2014},
}