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Vanilla 1.1.10 is a product of Lussumo. More Information: Documentation, Community Support.
The entry used to say (and still says)
According to ABF 17 the statement is originally due to to
T. Fukami, S. Ishihara, Almost Hermitian structure on $S^6$, Tohoku Math J. 7 (1955), 151–156 (doi:10.2748/tmj/1178245052)
There is this alternative attribution, which I have added now:
According to
the statement is originally due to
But looking through it, it’s maybe not so easy to decide.
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