Ting He 0001 Animashree Anandkumar Dakshi Agrawal Index-based sampling policies for tracking dynamic networks under sampling constraints. 1233-1241 2011 INFOCOM https://doi.org/10.1109/INFCOM.2011.5934904 conf/infocom/2011 db/conf/infocom/infocom2011.html#HeAA11