@article{Sauerland1999,
  author    = {Uli Sauerland},
  title     = {Why variables?},
  journal   = {Pius Tamanji, Masako Hirotani, and Nancy Hall (eds.), Proceedings of NELS 29},
  volume    = {29},
  number    = {1},
  pages     = {323 -- 337},
  url       = {https://docs.google.com/open?id=0Bz8d8ZE7fhuTYXFwdWlwUGJLUTA},
  year      = {1999},
}