@misc{indiciaecb9b5a20295e,
  title = {Almost sharp fronts for the surface quasi-geostrophic equation.},
  author = {Diego Córdoba and Charles Fefferman and José Luis Rodrigo},
  year = {2004},
  doi = {10.1073/pnas.0308154101},
  url = {https://pubmed.ncbi.nlm.nih.gov/14978276/},
  note = {Source identifier: 14978276}
}