@inproceedings{Ren:2016Un,
  author = "Ren, Xiu-Lei",
  title = "{Roper mass in chiral perturbation theory}",
  doi = "10.22323/1.253.0130",
  booktitle = "Proceedings of The 8th  International Workshop on Chiral Dynamics  {\textemdash} PoS(CD15)",
  year = 2016,
  volume = "253",
  pages = "130"
}