@article{Alembert2007,
  author    = {Jean le Rond d' Alembert},
  title     = {Extrait d'une lettre {\`a} Mr. de Maupertuis du 16. Nov. 1750},
  url       = {http://edoc.bbaw.de/oa/series/resdScGVakVgg/PDF/28ZAo7WElxFiQ.pdf},
  year      = {2007},
}