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The Koszul--Malgrange theorem, roughly, identifies holomorphic vectors bundles over a complex manifold, as those finitely generated projective modules admitting a flat $(0,1)$-connection. The reference given in nlab (in turn taken from Pali)

Jean-Louis Koszul, Bernard Malgrange, Sur certaine structures fibrées complexes, arch. mat, vol IX, 1958

and an unreferenced contribution from Grothendieck. Does anyone know where to get a copy of this reference. Moreover, what exactly was Grothendieck's contribution?

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    $\begingroup$ The article of Koszul and Malgrange is online here doi.org/10.1007/BF02287068 . It appears they discuss the relation to Grothendieck's ideas in the first few pages, but I would rather leave a translation / summary to an expert. $\endgroup$
    – j.c.
    Commented Jan 23, 2018 at 20:27
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    $\begingroup$ The unreferenced contribution from Grothendieck which is cited in Koszul-Malgrange is this expose by Serre in the Seminaire Cartan at ENS numdam.org/article/SHC_1953-1954__6__A18_0.pdf and the contribution of Grothendieck that Koszul-Malgrange refer to is simply the well-known Dolbeault-Grothendieck Lemma. $\endgroup$
    – YangMills
    Commented Jan 24, 2018 at 3:22

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