@inproceedings{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", booktitle = "Proceedings of 37th International Cosmic Ray Conference {\textemdash} PoS(ICRC2021)", year = 2021, volume = "395", pages = "627" }