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Oct 17, 2023 at 5:51 vote accept Licheng Zhang
Oct 17, 2023 at 5:51 comment added Licheng Zhang Thank you. It appears that your literature is relatively early. The 1-planar graphs (as a subclass of beyond planar graphs) can be traced back to Ringel, but it's probably quite challenging to trace its earliest origins for beyond planar graphs, even though it has gained popularity in recent years.
Oct 16, 2023 at 10:59 history edited Carlo Beenakker CC BY-SA 4.0
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Oct 16, 2023 at 10:39 history answered Carlo Beenakker CC BY-SA 4.0