author = {Javier Galbally and Marcos Martinez-Diaz and Julian Fierrez},
journal = {PLoS ONE},
month = {July},
number = {7},
pages = {e69897},
title = {Aging in Biometrics: An Experimental Analysis on On-Line Signature},
volume = {8},
year = {2013},
doi = {http://dx.plos.org/10.1371/journal.pone.0069897},