TY - RPRT TI - Reduced-action-integral approach for photon-photon interactions in vacuum AU - Ramsey, D. [Univ. of Rochester, NY (United States). Lab. for Laser Energetics] (ORCID:0000000265565139) AU - Formanek, M. S. [The Extreme Light Infrastructure, Dolní Břežany (Czech Republic)] (ORCID:0000000327046474) AU - Palastro, J. P. [Univ. of Rochester, NY (United States). Lab. for Laser Energetics] (ORCID:0000000267211924) PY - 2026 DO - 10.1103/ghy3-1ttg UR - https://www.osti.gov/biblio/3025670 ID - 3025670 ER -