@incollection{LaPolla2010,
  author    = {Randy J. LaPolla},
  title     = {Why languages differ : variation in the conventionalization of constraints on inference},
  booktitle = {Language Variation: Papers on variation and change in the Sinosphere and in the Indosphere in honour of James A. Matisoff, ed by David Bradley ; Pacific Linguistics; 555},
  url       = {http://victoria.linguistlist.org/~lapolla//rjlapolla/papers/whylgsdiffer.pdf},
  year      = {2010},
}