From e5288d57b00b9cf346241604b9c6830e4cae1be4 Mon Sep 17 00:00:00 2001
From: Thomas Beutlich <beutlich@users.noreply.github.com>
Date: Thu, 23 Oct 2025 19:51:01 +0200
Subject: [PATCH] refs #4699: Fix link

---
 Modelica/StateGraph.mo | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/Modelica/StateGraph.mo b/Modelica/StateGraph.mo
index 49784803f7..4b4517a2f3 100644
--- a/Modelica/StateGraph.mo
+++ b/Modelica/StateGraph.mo
@@ -578,8 +578,8 @@ based on the following references:
      Volume 35 - n. 1, 2001.<br>&nbsp;</dd>
 
 <dt>Harel, D. (1987):</dt>
-<dd> <a href=\"http://www.inf.ed.ac.uk/teaching/courses/seoc1/2005_2006/resources/statecharts.pdf\">
-      A Visual Formalism for Complex Systems</a>.
+<dd> <a href=\"https://doi.org/10.1016/0167-6423(87)90035-9\">
+      Statecharts: A Visual Formalism for Complex Systems</a>.
       Science of Computer Programming 8, 231-274. Department of Applied Mathematics,
       The Weizmann Institute of Science, Rehovot, Israel.<br>&nbsp;</dd>