Fred Damerau Tong Zhang Sholom M. Weiss Nitin Indurkhya Text categorization for a comprehensive time-dependent benchmark. 209-221 2004 40 Inf. Process. Manage. 2 http://dx.doi.org/10.1016/S0306-4573(03)00006-2 db/journals/ipm/ipm40.html#DamerauZWI04