## RenĂ© van Bevern and Viktoriia A. Slugina.
A historical note on the 3/2-approximation algorithm for the metric
traveling salesman problem.
*Historia Mathematica*, 53:118–127, 2020.

One of the most fundamental results in combinatorial
optimization is the polynomial-time
3/2-approximation algorithm for the metric traveling
salesman problem. It was presented by Christofides
in 1976 and is well known as "the Christofides
algorithm". Recently, some authors started calling
it "Christofides-Serdyukov algorithm", pointing out
that the same result was published independently in
the USSR in 1978. We provide some historic
background on Serdyukov's findings and a translation
of his article.

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