diff --git a/RNMnetwork/ES/catalan_technological_system.md b/RNMnetwork/ES/catalan_technological_system.md
index 945e485e..2db2ff7d 100644
--- a/RNMnetwork/ES/catalan_technological_system.md
+++ b/RNMnetwork/ES/catalan_technological_system.md
@@ -23,6 +23,10 @@ One of those two families, the one from Liguria, got military very strong roots.
 
 What function does this wireless brain machine interface? It's like the Unix command interpreter, the shell. It's the layer between the victim or the client of the remote neural monitoring network and the machines. It's what use modulation by the radio and antennas that transmit it's command and interpret our brain neural activity, better saying read and write our five senses. This network it's an artificial interference to them, injecting data and reading our electrical activity. If someone, like me, is a victim is nothing more that a human guinea pig. If I could take access analyzing the radio spectrum and reversing the wireless brain machine interface protocol I will be a normal client of the network. It's a long way of study but the owners of the facility always disturb my nights with tortures so I couldn't be at my 100%. It's difficult.
 
+A joint venture between the University of Murcia and another from Waterford in Ireland, write this interesting work about brain machine interfaces:
+
+- **Cybersecurity in Brain-Computer Interfaces: State-of-the-art, opportunities, and future challenges** [[5]](http://telecomlobby.com/RNMnetwork/documents/1908.03536.pdf)
+
 ###  External links
 
 1. [https://en.wikipedia.org/wiki/Brain%E2%80%93computer_interface](https://en.wikipedia.org/wiki/Brain–computer_interface)
@@ -33,4 +37,6 @@ What function does this wireless brain machine interface? It's like the Unix com
 
 4. https://en.wikipedia.org/wiki/Italian_Navy
 
+5. http://telecomlobby.com/RNMnetwork/documents/1908.03536.pdf
+
    
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