@article{machida_shimizu_2000, 
  title={Structure of Complex Enegy Levels as a Function of a Parameter}, 
  volume={55.2.2}, 
  DOI={10.11316/jpsgaiyo.55.2.2.0_229_3}, 
  number={0}, 
  publisher={The Physical Society of Japan}, 
  author={MACHIDA, M. and SHIMIZU, A.}, 
  year={2000}
  }