@article{cj95-01,
  author={Noam Nisan and Amnon Ta-Shma},
  title={Symmetric \(\mbox{\textsl{Logspace}}\)
    is Closed Under Complement},
  journal={Chicago Journal of Theoretical Computer Science},
  volume={1995},
  number={1},
  publisher={MIT Press},
  month={June},
  year={1995}
}