@article{Kirch2008,
  author    = {Gottfried Kirch},
  title     = {De Mercurio in Sole, Anno 1707},
  url       = {http://edoc.bbaw.de/oa/series/reSA1LVCopqgE/PDF/27vG03KUHeX12.pdf},
  year      = {2008},
}