@inproceedings{Blumenhagen:2000f+,
  author = "Blumenhagen, Ralph  and  Gorlichand, Lars  and  Kors, Boris",
  title = "{A New Class of Supersymmetric Orientifolds with D-branes at Angles}",
  doi = "10.22323/1.004.0010",
  booktitle = "Proceedings of Quantum aspects of gauge theories, supersymmetry and unification {\textemdash} PoS(tmr99)",
  year = 2000,
  volume = "004",
  pages = "010"
}