Get the Whitepaper called Elliptic Curve Cryptography Anomalous Curves. Written in Spanish.
You can download it from the following link: https://packetstormsecurity.com/files/download/93726/elliptic-curve.pdf
Source: https://packetstormsecurity.com/files/93726/Elliptic-Curve-Cryptography-Anomalous-Curves.html