@article{rigas_sánchez-soto_klimov_řeháček_hradil_2010, 
  title={Non-negative Wigner functions for orbital angular momentum states}, 
  volume={81}, 
  DOI={10.1103/physreva.81.012101}, 
  publisher={American Physical Society (APS)}, 
  author={Rigas and Sánchez-Soto and Klimov and Řeháček and Hradil}, 
  year={2010}, 
  month={Jan}
  }