removed further reading

doc.md

@@ -24,13 +24,3 @@ A few useful guidelines:
 * Before posting, first check if someone has already asked/answered your question!
 * If you are posting for the first time, your mail might be moderated. Therefore, it will take a bit of time for your messagge to appear in the group.
 * Please, do not post your question twice (or more times)!
-
-Further reading
-------------------------------------
-Here you can find a list of papers containing practical PLUMED tutorials:
-
-* [Bussi, G. and Tribello, G. A. (2019) Analyzing and biasing simulations with PLUMED](https://arxiv.org/abs/1812.08213)
-
-* [Barducci A., Pfaendtner J., Bonomi M. (2015) Tackling Sampling Challenges in Biomolecular Simulations. In: Kukol A. (eds) Molecular Modeling of Proteins. Methods in Molecular Biology (Methods and Protocols), vol 1215. Humana Press, New York, NY](https://link.springer.com/protocol/10.1007/978-1-4939-1465-4_8)
-
-* [Bussi, G. and Branduardi, D. (2015). Free‐Energy Calculations with Metadynamics: Theory and Practice. In Reviews in Computational Chemistry Volume 28 (eds A. L. Parrill and K. B. Lipkowitz)](https://onlinelibrary.wiley.com/doi/10.1002/9781118889886.ch1)