@Article{	  tong01leveled,
  author	= {Guanshan Tong and Michael J. O'Donnell},
  title		= {Leveled Garbage Collection},
  journal	= {Journal of Functional and Logic Programming},
  volume	= {2001},
  number	= {5},
  year		= {2001},
  urlbib	= {http://www.cs.ucsb.edu/~grze/papers/gc/tong01leveled.bib},
  url		= {http://www.cs.ucsb.edu/~grze/papers/gc/tong01leveled.bib},
  pdf		= {http://www.cs.ucsb.edu/~grze/papers/gc/tong01leveled.pdf},
  keyword	= {Garbage Collection}
}