Add DOI citation to step-44

diff --git a/examples/step-44/doc/intro.dox b/examples/step-44/doc/intro.dox
index 1660ea141c753d510ab4c6e487a714cbe5f733aa..26316bb0e5f3e5221f5869196252994c134d33c0 100644 (file)
--- a/examples/step-44/doc/intro.dox
+++ b/examples/step-44/doc/intro.dox
@@ -6,6 +6,8 @@ This material is based upon work supported by  the German Science Foundation (De
 Forschungsgemeinschaft, DFG), grant STE 544/39-1,  and the National Research Foundation of South Africa. 
 </i>
 
+@dealiiTutorialDOI{10.5281/zenodo.439772,https://zenodo.org/badge/DOI/10.5281/zenodo.439772.svg}
+
 <a name="Intro"></a>
 <h1>Introduction</h1>