@inproceedings{RenP92,
  title = {The Typology of Unknown Words: An Experimental Study of Two Corpora},
  author = {Xiaobo Ren and François Perrault},
  year = {1992},
  url = {http://acl.ldc.upenn.edu/C/C92/C92-1063.pdf},
  researchr = {https://researchr.org/publication/RenP92},
  cites = {0},
  citedby = {0},
  pages = {408-414},
  booktitle = {COLING},
}