BibTex format
@article{Pendry:2023:10.1364/OE.476961,
author = {Pendry, JB},
doi = {10.1364/OE.476961},
journal = {OPTICS EXPRESS},
pages = {452--458},
title = {Photon number conservation in time dependent systems [Invited]},
url = {http://dx.doi.org/10.1364/OE.476961},
volume = {31},
year = {2023}
}