@article{midgley_olsen_2012, 
  title={Spectral analysis of a four mode cluster state}, 
  volume={22}, 
  DOI={10.1134/s1054660x12070092}, 
  publisher={Pleiades Publishing Ltd}, 
  author={Midgley and Olsen}, 
  year={2012}, 
  month={Jun}
  }