Are Subsets Necessary in Martin-Löf Type Theory?

Simon Thompson. Are Subsets Necessary in Martin-Löf Type Theory?. In J. Paul Myers Jr., Michael J. O Donnell, editors, Constructivity in Computer Science, Summer Symposium, San Antonio, Texas, USA, June 19-22, Proceedings. Volume 613 of Lecture Notes in Computer Science, pages 46-57, Springer, 1991.

@inproceedings{Thompson91:0,
  title = {Are Subsets Necessary in Martin-Löf Type Theory?},
  author = {Simon Thompson},
  year = {1991},
  tags = {type theory},
  researchr = {https://researchr.org/publication/Thompson91%3A0},
  cites = {0},
  citedby = {0},
  pages = {46-57},
  booktitle = {Constructivity in Computer Science, Summer Symposium, San Antonio, Texas, USA, June 19-22, Proceedings},
  editor = {J. Paul Myers Jr. and Michael J. O Donnell},
  volume = {613},
  series = {Lecture Notes in Computer Science},
  publisher = {Springer},
  isbn = {3-540-55631-1},
}