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 * [Joerg Mueller](http://www.joergm.com/2010/09/executing-shell-commands-in-groovy/) - Executing shell commands in Groovy
 * [Groovy](http://groovy-lang.org/learn.html) - learning section of the Groovy website.
 * [Iván López Martín](https://www.slideshare.net/ilopmar/metaprogramming-with-groovy) - (2014) [Slides] Metaprogramming with groovy
+* [Gregory Dickson](https://medium.com/@gregory.d.dickson/why-groovy-is-so-groovy-or-a-beginners-guide-to-hacking-groovy-e0ad6f32c300) - (2017) Why Groovy is so groovy or a beginners guide to hacking Groovy
 
 ## Java
 * [Hugo Matilla/Effective-JAVA-Summary](https://github.com/HugoMatilla/Effective-JAVA-Summary) - Summary of the book Effective Java 2nd Edition by Joshua Bloch