Theory of the spin liquid state of the Heisenberg antiferromagnet.

@article{Kalmeyer1989TheoryOT,
  title={Theory of the spin liquid state of the Heisenberg antiferromagnet.},
  author={Kalmeyer and Laughlin},
  journal={Physical review. B, Condensed matter},
  year={1989},
  volume={39 16},
  pages={11879-11899}
}