@article{escidoc:2566605, title = {Fluctuational electrodynamics for nonlinear materials in and out of thermal equilibrium}, author = {Soo, Heino and Kr\"uger, Matthias}, journal = {Physical Review B}, volume = {97}, number = {4}, pages = {045412}, publisher = {American Physical Society}, address = {Woodbury, NY}, year = {2018}, doi = {10.1103/PhysRevB.97.045412} }