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Jun 26, 2017 at 23:10 vote accept Thomas Rot
Jun 26, 2017 at 23:07 comment added Thomas Rot This clears up the history to me. I was most interested in the geometric viewpoint, and it does seem it is due to Rohlin. Thank you very much for your effort.
Jun 26, 2017 at 22:54 comment added David Roberts Note that Massey-Whitehead only found the order of $\pi_3^s$, not that fact it is cyclic. So Rokhlin it is!
Jun 26, 2017 at 22:48 history edited David Roberts CC BY-SA 3.0
Added link to Serre's CR note
Jun 26, 2017 at 22:43 history answered David Roberts CC BY-SA 3.0