@article{Rittenberg:2000cu,
  author = "Rittenberg, Vladimir",
  title = "{Valence bound ground states in quantum antiferromagnets and quadratic algebras }",
  doi = "10.22323/1.006.0048",
  journal = "PoS",
  year = 2000,
  volume = "tmr2000",
  pages = "048"
}