@article{Lavignac:1999s3,
  author = "Lavignac, S.",
  title = "{Heterotic Type I Duality in Four Dimensions in the Presence of Anomalous U(1)'s}",
  doi = "10.22323/1.002.0018",
  journal = "PoS",
  year = 1999,
  volume = "trieste99",
  pages = "018"
}