@inproceedings{Kagaya:2016iH, author = "Kagaya, Mika and Katagiri, Hideaki and Yoshida, Tatsuo", title = "{Constraints on acceleration of ultra high-energy cosmic rays in Fermi gamma-ray sources }", doi = "10.22323/1.236.0530", booktitle = "Proceedings of The 34th International Cosmic Ray Conference {\textemdash} PoS(ICRC2015)", year = 2016, volume = "236", pages = "530" }