no. 2
A generalization of the sizes of differential equations and its applications to G-function theory
Annali della Scuola Normale Superiore di Pisa - Classe di Scienze, Série 4, Tome 30 (2001) no. 2, pp. 465-497. 
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     title = {A generalization of the sizes of differential equations and its applications to $G$-function theory},
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Nagata, Makoto. A generalization of the sizes of differential equations and its applications to $G$-function theory. Annali della Scuola Normale Superiore di Pisa - Classe di Scienze, Série 4, Tome 30 (2001) no. 2, pp. 465-497. http://www.numdam.org/item/ASNSP_2001_4_30_2_465_0/

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