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Jul 27, 2020 at 13:53 comment added user44143 I hope someone will extract a construction from this paper for the special case of $\mathbb{R}^4$; that would be worth posting as a separate answer.
Jul 27, 2020 at 13:47 history edited user44143 CC BY-SA 4.0
added detail on Kihara's paper
Jul 27, 2020 at 10:16 history answered Arno CC BY-SA 4.0