TY - RPRT TI - Fermi-LAT View on Three Ultra-high-energy 1LHAASO Sources in the 52° < l < 55° Region AU - Liu, Linjie [Chinese Academy of Sciences (CAS), Kunming (China); University of Chinese Academy of Sciences, Beijing (China)] (ORCID:000900046750821X) AU - Hou, Xian [Chinese Academy of Sciences (CAS), Kunming (China)] (ORCID:0000000309336101) AU - Martin, Pierrick [Université de Toulouse (France); Centre National de la Recherche Scientifique (CNRS), Toulouse (France). Institut de Recherche en Astrophysique et Planétologie (IRAP); Paul Sabatier University – Toulouse III (UPS) (France); Centre National d'Études Spatiales (CNES), Toulouse (France)] AU - Yang, Chuyuan [Chinese Academy of Sciences (CAS), Kunming (China)] (ORCID:0000000169035306) PY - 2026 DO - 10.3847/1538-4357/ae66eb UR - https://www.osti.gov/biblio/3374047 ID - 3374047 ER -