no. 4
Minimal atlases of manifolds
Cahiers de Topologie et Géométrie Différentielle Catégoriques, Volume 26 (1985) no. 4, pp. 389-397 
@article{CTGDC_1985__26_4_389_0,
     author = {Cavicchioli, Alberto and Grasselli, Luigi},
     title = {Minimal atlases of manifolds},
     journal = {Cahiers de Topologie et G\'eom\'etrie Diff\'erentielle Cat\'egoriques},
     pages = {389--397},
     publisher = {Dunod \'editeur, publi\'e avec le concours du CNRS},
     volume = {26},
     number = {4},
     year = {1985},
     mrnumber = {816648},
     zbl = {0593.55002},
     language = {en},
     url = {https://www.numdam.org/item/CTGDC_1985__26_4_389_0/}
}
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Cavicchioli, Alberto; Grasselli, Luigi. Minimal atlases of manifolds. Cahiers de Topologie et Géométrie Différentielle Catégoriques, Volume 26 (1985) no. 4, pp. 389-397. https://www.numdam.org/item/CTGDC_1985__26_4_389_0/

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