Maxwell à la Helmholtz: Electromagnetic scattering by 3D perfect electric conductors via Helmholtz integral operatorsJuan Burbano-Gallegos, Carlos Pérez-Arancibia and Catalin TurcESAIM: M2AN, 60 1 (2026) 273-315DOI: https://doi.org/10.1051/m2an/2025101