@misc{indiciae64f6628e1295,
  title = {Is the English present progressive unique.},
  author = {E R Mapstone and P L Harris},
  year = {1985},
  doi = {10.1017/s0305000900006528},
  url = {https://pubmed.ncbi.nlm.nih.gov/4019612/},
  note = {Source identifier: 4019612}
}