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Nov 6, 2022 at 16:27 vote accept Aserrar Youssef
Nov 6, 2022 at 16:23 history edited LSpice CC BY-SA 4.0
Springer -> DOI link
Nov 6, 2022 at 16:23 comment added LSpice Ebanks also has a later paper on the more general version the OP discusses: Ebanks - Around the sine addition law and d'Alembert's equation on semigroups.
Nov 6, 2022 at 15:35 history answered Carlo Beenakker CC BY-SA 4.0