Introducing what came to be called the quantum Yang-Baxter equation, in the course of discussing lattice integrable models:
Rodney J. Baxter, Solvable eight-vertex model on an arbitrary planar lattice, Philos. Trans. Royal Society A 289 1359 (1978) [doi:10.1098/rsta.1978.0062]
Rodney J. Baxter, Exactly Solved Models in Statistical Mechanics, Academic Press (1982) [webpage, pdf]
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