Leave a note in step-32.

diff --git a/doc/doxygen/references.bib b/doc/doxygen/references.bib
index f443f79b47cd68d2a8c79cef9a806d9c0b9ca8fe..765fdd60a709adfa2240f6194f2cbb5e0f2442d0 100644 (file)
--- a/doc/doxygen/references.bib
+++ b/doc/doxygen/references.bib
@@ -356,6 +356,20 @@
 }
 
 
+%-------------------------------------------------------------------------------
+% Step 32
+%-------------------------------------------------------------------------------
+
+@Article{HDGB17,
+  author =       {T. Heister and J. Dannberg and R. Gassm{\"o}ller and W. Bangerth},
+  title =        {High Accuracy Mantle Convection Simulation through Modern Numerical Methods. II: Realistic Models and Problems},
+  journal =      {Geophysical Journal International},
+  year =         2017,
+  volume =    210,
+  pages =     {833--851}
+  }
+
+
 %-------------------------------------------------------------------------------
 % Step 43
 %-------------------------------------------------------------------------------

diff --git a/examples/step-32/step-32.cc b/examples/step-32/step-32.cc
index 4ff165b3c1a8a2a97c4b6b03b430417eb9f0397b..f2c03a2aaf151f9c74bf282eb3c37109909855d4 100644 (file)
--- a/examples/step-32/step-32.cc
+++ b/examples/step-32/step-32.cc
@@ -2868,7 +2868,9 @@ namespace Step32
     // minimal mesh size as in step-31, we compute local CFL numbers, i.e., on
     // each cell we compute the maximum velocity times the mesh size, and
     // compute the maximum of them. Hence, we need to choose the factor in
-    // front of the time step slightly smaller.
+    // front of the time step slightly smaller. (We later re-considered this
+    // approach towards time stepping. If you're curious about this, you may
+    // want to read the time stepping section in @cite HDGB17 .)
     //
     // After temperature right hand side assembly, we solve the linear system
     // for temperature (with fully distributed vectors without any ghosts),