Stem universum$ (all stems)

2 papers:

SIGIR-2011-ZhangWS11a #clustering #documentation

Document clustering with universum (DZ, JW, LS), pp. 873–882.

ICML-2006-WestonCSBV

Inference with the Universum (JW, RC, FHS, LB, VV), pp. 1009–1016.