A variational approach to the equation in R n. Bianchi, G. & Egnell, H. Archive for rational mechanics and analysis, 122(2):159–182, Springer, 1993.
bibtex   
@article{bianchi1993variational,
  title={A variational approach to the equation in R n},
  author={Bianchi, G. and Egnell, H.},
  journal={Archive for rational mechanics and analysis},
  volume={122},
  number={2},
  pages={159--182},
  year={1993},
  publisher={Springer}
}

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