@article{CRPHYS_2024__25_S2_A2_0,
     author = {Raul Aguero-Santacruz and David Bermudez},
     title = {Negative frequencies and negative norms in analogue {Hawking} radiation systems},
     journal = {Comptes Rendus. Physique},
     publisher = {Acad\'emie des sciences, Paris},
     year = {2024},
     doi = {10.5802/crphys.177},
     language = {en},
     note = {Online first},
}