@article{cats9-4,
  author{Wataru Matsubara, Shunsuke Inenaga and Ayumi Shinohara},
  title={An Efficient Algorithm to Test Square-Freeness of Strings Compressed by Balanced Straight Line Programs }
  journal={Chicago Journal of Theoretical Computer Science},
  volume={2010},
  number={7},
  publisher={University of Chicago},
  month={June},
  year={2010}
}