Yufei Tao Xiang Lian Dimitris Papadias Marios Hadjieleftheriou Random Sampling for Continuous Streams with Arbitrary Updates. 96-110 2007 19 IEEE Trans. Knowl. Data Eng. 1 http://doi.ieeecomputersociety.org/10.1109/TKDE.2007.14 db/journals/tkde/tkde19.html#TaoLPH07