FYI (cfr. infra link):
 
"Biometric Data Mining Applied to On-line
Recognition Systems"
 
José Alberto Hernández-Aguilar, Crispin Zavala, Ocotlán Díaz,
Gennadiy Burlak, Alberto Ochoa and Julio César Ponce.
 
http://cdn.intechopen.com/pdfs/14647/InTech-Biometric_data_mining_applied_to_on_line_recognition_systems.pdf
 
Buon 25 aprile!
A presto,
Marco Mendola