@INBOOK { ramos09encyclopediaBiometrics,
author = {Daniel Ramos and Javier Gonzalez-Dominguez and Doroteo T. Toledano and Joaquin Gonzalez-Rodriguez},
booktitle = {Encyclopedia of Biometrics (ISBN 978-0-387-73003-5)},
editor = {Stan Z. Li},
month = {July},
publisher = {Springer},
title = {Speaker Feature},
year = {2009},
}