engKarbstein, FelixLeading Low-Temperature Correction to the Heisenberg–Euler LagrangianParticles 9(2), 39 (2026). doi:10.3390/particles9020039info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionMDPI AG2026info:eu-repo/semantics/openAccessDEhttps://repository.gsi.de/record/366886https://repository.gsi.de/search?p=id:%22GSI-2026-00583%22Researchersinfo:eu-repo/semantics/altIdentifier/doi/10.3390/particles9020039info:eu-repo/semantics/altIdentifier/doi/10.15120/GSI-2026-00583info:eu-repo/semantics/altIdentifier/issn/2571-712X