@article{Helm2009,
  author    = {Otto Helm},
  title     = {Mittheilungen {\"u}ber Bernstein : 8. Ueber einige Einschl{\"u}sse im Bernstein},
  journal   = {Schriften der Naturforschenden Gesellschaft in Danzig},
  volume    = {6},
  pages     = {125 -- 127},
  year      = {2009},
}