Fresnel polarisation of infra-red radiation by elemental bismuthBruno S.C. Alexandre, Luís C. Martins, Jaime E. Santos, António J. Pontes and Nuno M.R. PeresEur. Phys. J. B, 93 6 (2020) 119DOI: https://doi.org/10.1140/epjb/e2020-10090-9