[doc] updates documentation

README.rst

 .. image:: https://gitlab.mpcdf.mpg.de/TurTLE/turtle/badges/develop/pipeline.svg
     :target: https://gitlab.mpcdf.mpg.de/TurTLE/turtle/commits/develop
 
+.. sectnum::
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 =========================================
 Turbulence Tools: Lagrangian and Eulerian
 =========================================
@@ -335,17 +339,22 @@ The stand-alone `doxygen`-generated documentation is present at
 Reference publication
 ---------------------
 
-Please see https://arxiv.org/abs/2107.01104 for a description of TurTLE,
-as well as a detailed discussion of the novel particle tracking
-approach.
+Please see CPC v278 p108406 (https://doi.org/10.1016/j.cpc.2022.108406) for
+a description of TurTLE, as well as a detailed discussion of the novel
+particle tracking approach.
 This is also the publication to be cited by works that made use of TurTLE.
 
+Alternatively, you may consult the preprint at
+https://doi.org/10.1016/j.cpc.2022.108406.
+
 -------
 Contact
 -------
 
-If you have any questions, comments or suggestions, please contact
-Dr. Cristian C. Lalescu (Cristian.Lalescu@mpcdf.mpg.de).
+If you have any questions, comments or suggestions, please contact us
+via the gitlab interface at https://gitlab.mpcdf.mpg.de/TurTLE/turtle,
+or write directly to Dr. Cristian C. Lalescu
+(Cristian.Lalescu@mpcdf.mpg.de).
 
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