@article{Liu:20142q,
  author = "Liu, Keh-Fei  and  Chen, Ying  and  Gong, Ming  and  Sufian, Raza  and  Sun, Mingyang  and  Li, Anyi",
  title = "{The Roper Puzzle}",
  doi = "10.22323/1.187.0507",
  journal = "PoS",
  year = 2014,
  volume = "LATTICE 2013",
  pages = "507"
}