@misc{indiciaee75338c35619,
  title = {A class of bounded pseudo-differential operators.},
  author = {A P Calderón and R Vaillancourt},
  year = {1972},
  doi = {10.1073/pnas.69.5.1185},
  url = {https://pubmed.ncbi.nlm.nih.gov/16591985/},
  note = {Source identifier: 16591985}
}