@inproceedings{Ishida:2014Aa,
  author = "Ishida, Shin",
  title = "{"Quark Confinement'' and Evolution of Covariant Hadron-Classification Scheme}",
  doi = "10.22323/1.205.0067",
  booktitle = "Proceedings of XV International Conference on Hadron Spectroscopy {\textemdash} PoS(Hadron 2013)",
  year = 2014,
  volume = "205",
  pages = "067"
}