[BUGFIX] Fix crash in parser.

[ginac.git] / ginac / utils.h

diff --git a/ginac/utils.h b/ginac/utils.h
index a6e28d74ef6026c83a1ab90a9502b39940b82c74..e8ac1bd1a3c6585a838b965dfb7810b00ddc3927 100644 (file)
--- a/ginac/utils.h
+++ b/ginac/utils.h
@@ -4,7 +4,7 @@
  *  of any interest to the user of the library. */
 
 /*
- *  GiNaC Copyright (C) 1999-2019 Johannes Gutenberg University Mainz, Germany
+ *  GiNaC Copyright (C) 1999-2024 Johannes Gutenberg University Mainz, Germany
  *
  *  This program is free software; you can redistribute it and/or modify
  *  it under the terms of the GNU General Public License as published by
@@ -397,7 +397,7 @@ private:
        // Generates all distinct permutations of a multiset.
        // (Based on Aaron Williams' algorithm 1 from "Loopless Generation of
        // Multiset Permutations using a Constant Number of Variables by Prefix
-       // Shifts." <http://webhome.csc.uvic.ca/~haron/CoolMulti.pdf>)
+       // Shifts." <https://dl.acm.org/doi/pdf/10.5555/1496770.1496877>)
        struct coolmulti {
                // element of singly linked list
                struct element {