@article{2008,
  author    = {- -},
  title     = {Observationes tricennales circa frigus hyemale ex Ephemeridibus V. Cl. Samuelis Keiheri},
  url       = {http://edoc.bbaw.de/oa/series/reP87BjXT9446/PDF/23VJkLwxiL5OM.pdf},
  year      = {2008},
}