Staircase functions, spectral rigidity, and a rule for quantizing chaos.

@article{Aurich1992StaircaseFS,
  title={Staircase functions, spectral rigidity, and a rule for quantizing chaos.},
  author={J Aurich and M Steiner},
  journal={Physical review. A, Atomic, molecular, and optical physics},
  year={1992},
  volume={45 2},
  pages={583-592}
}