@article{SACK2007,
  author    = {August Friedrich Wilhelm SACK},
  title     = {Sur de nouvelles p{\´e}trifications marines},
  journal   = {Histoire de l'Acad{\´e}mie Royale des Sciences et des Belles-Lettres de Berlin ; 1745 ; Hist.},
  pages     = {67 -- 70},
  url       = {http://edoc.bbaw.de/oa/series/reDJRScuYbsk6/PDF/25puOctsUC7ig.pdf},
  year      = {2007},
}