no. 2
Theory and applications of abstract normal coordinates in a general differential geometry
Annali della Scuola Normale Superiore di Pisa - Scienze Fisiche e Matematiche, Série 2, Tome 7 (1938) no. 2, pp. 157-175. 
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     title = {Theory and applications of abstract normal coordinates in a general differential geometry},
     journal = {Annali della Scuola Normale Superiore di Pisa - Scienze Fisiche e Matematiche},
     pages = {157--175},
     publisher = {Scuola normale superiore},
     volume = {Ser. 2, 7},
     number = {2},
     year = {1938},
     zbl = {0018.36701},
     language = {en},
     url = {http://www.numdam.org/item/ASNSP_1938_2_7_2_157_0/}
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Michal, Aristotle D.; Hyers, Donald H. Theory and applications of abstract normal coordinates in a general differential geometry. Annali della Scuola Normale Superiore di Pisa - Scienze Fisiche e Matematiche, Série 2, Tome 7 (1938) no. 2, pp. 157-175. http://www.numdam.org/item/ASNSP_1938_2_7_2_157_0/

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(2). La Differentielle dans l'Analyse Générale. Annals of Mathematics, vol. 34 (1933), pp. 546-572.

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(4). Abstract Covariant Vector Fields in a General Absolute Calculus. Amer. Journal of Math., vol. 59 (1937), pp. 306-314.

(5). General Riemannian Differential Geometry, to be published elsewhere.

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