@article{Guo:2021su, author = "Guo, Xiao-Lei and Xin, Yu-Liang", title = "{Energy-Dependent Morphological Study of HESS J1857+026 with Fermi-LAT}", doi = "10.22323/1.395.0627", journal = "PoS", year = 2021, volume = "ICRC2021", pages = "627" }