How does foreigner-directed speech differ from other forms of listener-directed clear speaking styles?

Valérie Hazan, Maria Uther, Sonia Granlund. How does foreigner-directed speech differ from other forms of listener-directed clear speaking styles?. In Maria Wolters, Judy Livingstone, Bernie Beattie, Rachel Smith, Mike MacMahon, Jane Stuart-Smith, James M. Scobbie, editors, 18th International Congress of Phonetic Sciences, ICPhS 2015, Glasgow, UK, August 10-14, 2015. University of Glasgow, 2015. [doi]

@inproceedings{HazanUG15,
  title = {How does foreigner-directed speech differ from other forms of listener-directed clear speaking styles?},
  author = {Valérie Hazan and Maria Uther and Sonia Granlund},
  year = {2015},
  url = {https://www.internationalphoneticassociation.org/icphs-proceedings/ICPhS2015/Papers/ICPHS0346.pdf},
  researchr = {https://researchr.org/publication/HazanUG15},
  cites = {0},
  citedby = {0},
  booktitle = {18th International Congress of Phonetic Sciences, ICPhS 2015, Glasgow, UK, August 10-14, 2015},
  editor = {Maria Wolters and Judy Livingstone and Bernie Beattie and Rachel Smith and Mike MacMahon and Jane Stuart-Smith and James M. Scobbie},
  publisher = {University of Glasgow},
  isbn = {978-0-85261-942-1},
}