fix a doxygen citation

might be related to #9222

diff --git a/include/deal.II/particles/generators.h b/include/deal.II/particles/generators.h
index bac34ab166b9d76948424c332531545ed457e44a..a65d8d26378c49da79a4d36b57bf4722150f2490 100644 (file)
--- a/include/deal.II/particles/generators.h
+++ b/include/deal.II/particles/generators.h
@@ -122,8 +122,8 @@ namespace Particles
      * (if option @p random_cell_selection set to true). In either case the position of
      * individual particles inside the cell is computed randomly.
      *
-     * The algorithm implemented in the function is described in @cite
-     * GLHPW2018.
+     * The algorithm implemented in the function is described in
+     * @cite GLHPW2018.
      *
      * @param[in] triangulation The triangulation associated with the @p particle_handler.
      *