On the subanalyticity of Carnot-Caratheodory distances
Annales de l'I.H.P. Analyse non linéaire, Tome 18 (2001) no. 3, pp. 359-382. 
@article{AIHPC_2001__18_3_359_0,
     author = {Agrachev, Andrei and Gauthier, Jean-Paul},
     title = {On the subanalyticity of {Carnot-Caratheodory} distances},
     journal = {Annales de l'I.H.P. Analyse non lin\'eaire},
     pages = {359--382},
     publisher = {Elsevier},
     volume = {18},
     number = {3},
     year = {2001},
     zbl = {1001.93014},
     language = {en},
     url = {http://www.numdam.org/item/AIHPC_2001__18_3_359_0/}
}
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Agrachev, Andrei; Gauthier, Jean-Paul. On the subanalyticity of Carnot-Caratheodory distances. Annales de l'I.H.P. Analyse non linéaire, Tome 18 (2001) no. 3, pp. 359-382. http://www.numdam.org/item/AIHPC_2001__18_3_359_0/

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