@article{Kneipp:2002kE,
  author = "Kneipp, Marco Aurelio Cattacin",
  title = "{BPS Z_k strings, string tension and confinement in non-Abelian theories.   }",
  doi = "10.22323/1.008.0020",
  journal = "PoS",
  year = 2002,
  volume = "unesp2002",
  pages = "020"
}