From 158a7e1acda71790f7c282949d1473d51e654d58 Mon Sep 17 00:00:00 2001
From: "Miss Islington (bot)"
 <31488909+miss-islington@users.noreply.github.com>
Date: Sun, 12 Nov 2023 02:22:44 +0100
Subject: [3.12] gh-111933: fix broken link to A.Neumaier article (gh-111937)
 (gh-111993)

---
 Python/bltinmodule.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/Python/bltinmodule.c b/Python/bltinmodule.c
index 7f366b4..84fbc33 100644
--- a/Python/bltinmodule.c
+++ b/Python/bltinmodule.c
@@ -2605,7 +2605,10 @@ builtin_sum_impl(PyObject *module, PyObject *iterable, PyObject *start)
             }
             if (PyFloat_CheckExact(item)) {
                 // Improved Kahan–Babuška algorithm by Arnold Neumaier
-                // https://www.mat.univie.ac.at/~neum/scan/01.pdf
+                // Neumaier, A. (1974), Rundungsfehleranalyse einiger Verfahren
+                // zur Summation endlicher Summen.  Z. angew. Math. Mech.,
+                // 54: 39-51. https://doi.org/10.1002/zamm.19740540106
+                // https://en.wikipedia.org/wiki/Kahan_summation_algorithm#Further_enhancements
                 double x = PyFloat_AS_DOUBLE(item);
                 double t = f_result + x;
                 if (fabs(f_result) >= fabs(x)) {
-- 
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