replace reference entry with bibtex format, add esmvaltool and core citation, update the text

Author: SarahAlidoost

CITATION

@@ -1,17 +1,46 @@
 Please cite this tutorial as:
 
-- ESMValTool 2.0 tutorial, ESMValTool developers, version [ADD VERSION],
-  [https://github.com/ESMValGroup/ESMValTool_tutorial](https://github.com/ESMValGroup/ESMValTool_tutorial),
-  [DATE].
-
-and cite ESMValTool as:
-
-- Righi, M., Andela, B., Eyring, V., Lauer, A., Predoi, V., Schlund, M.,
-  Vegas-Regidor, J., Bock, L., Brötz, B., de Mora, L., Diblen, F., Dreyer, L.,
-  Drost, N., Earnshaw, P., Hassler, B., Koldunov, N., Little, B., Loosveldt Tomas,
-  S., and Zimmermann, K.:
-  Earth System Model Evaluation Tool (ESMValTool) v2.0 – technical overview,
-  Geosci. Model Dev., 13, 1179–1199, https://doi.org/10.5194/gmd-13-1179-2020,2020.
+- ESMValTool tutorial authors, "ESMValTool 2.0 tutorial", version [ADD VERSION],
+  August, 2020,
+  [https://github.com/ESMValGroup/ESMValTool_tutorial](https://github.com/ESMValGroup/ESMValTool_tutorial).
+
+and cite ESMValTool paper as:
+
+@article{Righi2020,
+  doi = {10.5194/gmd-13-1179-2020},
+  url = {https://doi.org/10.5194/gmd-13-1179-2020},
+  year = {2020},
+  month = mar,
+  publisher = {Copernicus {GmbH}},
+  volume = {13},
+  number = {3},
+  pages = {1179--1199},
+  author = {Mattia Righi and Bouwe Andela and Veronika Eyring and Axel Lauer and Valeriu Predoi and Manuel Schlund and Javier Vegas-Regidor and Lisa Bock and Bj\"{o}rn Br\"{o}tz and Lee de Mora and Faruk Diblen and Laura Dreyer and Niels Drost and Paul Earnshaw and Birgit Hassler and Nikolay Koldunov and Bill Little and Saskia Loosveldt Tomas and Klaus Zimmermann},
+  title = {Earth System Model Evaluation Tool ({ESMValTool}) v2.0 {\textendash} technical overview},
+  journal = {Geoscientific Model Development}
+}
+
+and cite ESMValTool and ESMValCore software as:
+
+@misc{https://doi.org/10.5281/zenodo.3401363,
+  doi = {10.5281/ZENODO.3401363},
+  url = {https://zenodo.org/record/3401363},
+  author = {Andela,  Bouwe and Broetz,  Bjoern and de Mora,  Lee and Drost,  Niels and Eyring,  Veronika and Koldunov,  Nikolay and Lauer,  Axel and Mueller,  Benjamin and Predoi,  Valeriu and Righi,  Mattia and Schlund,  Manuel and Vegas-Regidor,  Javier and Zimmermann,  Klaus and Adeniyi,  Kemisola and Arnone,  Enrico and Bellprat,  Omar and Berg,  Peter and Bock,  Lisa and Caron,  Louis-Philippe and Carvalhais,  Nuno and Cionni,  Irene and Cortesi,  Nicola and Corti,  Susanna and Crezee,  Bas and Davin,  Edouard Leopold and Davini,  Paolo and Deser,  Clara and Diblen,  Faruk and Docquier,  David and Dreyer,  Laura and Ehbrecht,  Carsten and Earnshaw,  Paul and Gier,  Bettina and Gonzalez-Reviriego,  Nube and Goodman,  Paul and Hagemann,  Stefan and von Hardenberg,  Jost and Hassler,  Birgit and Hunter,  Alasdair and Kadow,  Christopher and Kindermann,  Stephan and Koirala,  Sujan and Lledó,  Lloren\c{c} and Lejeune,  Quentin and Lembo,  Valerio and Little,  Bill and Loosveldt-Tomas,  Saskia and Lorenz,  Ruth and Lovato,  Tomas and Lucarini,  Valerio and Massonnet,  Fran\c{c}ois and Mohr,  Christian Wilhelm and Amarjiit,  Pandde and Pérez-Zanón,  Núria and Phillips,  Adam and Russell,  Joellen and Sandstad,  Marit and Sellar,  Alistair and Senftleben,  Daniel and Serva,  Federico and Sillmann,  Jana and Stacke,  Tobias and Swaminathan,  Ranjini and Torralba,  Verónica and Weigel,  Katja},
+  title = {ESMValTool},
+  publisher = {Zenodo},
+  year = {2020},
+  copyright = {Apache License 2.0}
+}
+
+@misc{https://doi.org/10.5281/zenodo.3387139,
+  doi = {10.5281/ZENODO.3387139},
+  url = {https://zenodo.org/record/3387139},
+  author = {Andela,  Bouwe and Broetz,  Bjoern and de Mora,  Lee and Drost,  Niels and Eyring,  Veronika and Koldunov,  Nikolay and Lauer,  Axel and Predoi,  Valeriu and Righi,  Mattia and Schlund,  Manuel and Vegas-Regidor,  Javier and Zimmermann,  Klaus and Bock,  Lisa and Diblen,  Faruk and Dreyer,  Laura and Earnshaw,  Paul and Hassler,  Birgit and Little,  Bill and Loosveldt-Tomas,  Saskia},
+  title = {ESMValCore},
+  publisher = {Zenodo},
+  year = {2020},
+  copyright = {Apache License 2.0}
+}
 
 See additional resources at https://www.esmvaltool.org/references.html.