author = {F. Alonso-Fernandez and J. Fierrez-Aguilar and A. Gilperez and J. Ortega-Garcia},
booktitle = {Proc. IEEE ISPA, Spec. Sess. on Signal and Image Processing for Biometrics},
month = {September},
note = {invited paper},
title = {Impact of time variability in off-line writer identification and verification},
year = {2009},