Tangents to an analytic variety. Whitney, H. Ann. of Math., 81:496–549, 1965.
bibtex   
@article{Whi65,
  author = "Hassler Whitney",
   title = "Tangents to an analytic variety",
 journal = "Ann. of Math.",
  volume = 81,
    year = 1965,
   pages = "496--549"}

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