Supergravities without an action: Gauging the trombone

@article{Diffon2008SupergravitiesWA,
  title={Supergravities without an action: Gauging the trombone},
  author={Arnaud Le Diffon and Henning Samtleben},
  journal={Nuclear Physics},
  year={2008},
  volume={811},
  pages={1-35}
}
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