Lívia C. F. Araújo Luiz H. R. Sucupira Miguel Gustavo Lizárraga Lee Luan Ling João Baptista T. Yabu-uti User authentication through typing biometrics features. 851-855 2005 53 IEEE Transactions on Signal Processing 2-2 http://dx.doi.org/10.1109/TSP.2004.839903(410)53 db/journals/tsp/tsp53.html#AraujoSLLY05