@Article{BFMUW87,
author={Allan Borodin and Faith Fich and
Freidhelm Meyer auf der Heide and Eliezer
Upfal and Avi Wigderson},
title={A time-space tradeoff for element
distinctness},
journal={SIAM Journal on Computing},
volume={16},
month={1},
pages={97-99},
year={1987},
}