Lower bounds for the energy of unit vector fields and applications. Sandier, E. Journal of Functional Analysis, 152(2):379--403, Elsevier, 1998.
bibtex   
@article{ San98,
  title = {Lower bounds for the energy of unit vector fields and applications},
  author = {Sandier, E.},
  journal = {Journal of Functional Analysis},
  volume = {152},
  number = {2},
  pages = {379--403},
  year = {1998},
  publisher = {Elsevier}
}

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