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$\begingroup$ It was recently realized that the theorem that there is no complex structure on the 6-sphere that is orthogonal with respect to the standard metric was actually proved much earlier than in Lebrun's paper (which dates from the 1980s). The earliest proof I know is in a 1953 paper by André Blanchard: Recherche de structures analytiques complexes sur certaines variétés. C. R. Acad. Sci. Paris, t. 236 (1953), 657–659. MR0052870 $\endgroup$
– Robert Bryant
Commented Jan 11, 2017 at 11:47
6

$\begingroup$ Blanchard's paper can be freely read and downloaded online here: gallica.bnf.fr/ark:/12148/bpt6k3188h/f657.item $\endgroup$
– YangMills
Commented Nov 1, 2017 at 13:02

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