@INPROCEEDINGS{Gib_01,
  AUTHOR     = {P. Gibbons and S. Tirthapura},
  TITLE      = {Estimating simple functions on the union of data streams},
  BOOKTITLE  = {{ACM} Symposium on Parallel Algorithms and Architectures},
  YEAR       = {2001},
  ADDRESS    = {},
  MONTH      = {},
  PAGES      = {281--291},
  URL        = {http://www.aladdin.cs.cmu.edu/papers/pdfs/y2001/est_simp.pdf},
}