Hammarström, Harald. 2010. Rarities in numeral systems. In Wohlgemuth, Jan and Cysouw, Michael (eds.), Rethinking universals. How rarities affect linguistic theory, 11-60. Berlin: Mouton De Gruyter.
@incollection{jacquesestimative-hammarstrom10numeral, author = {Hammarström, Harald}, booktitle = {Rethinking universals. How rarities affect linguistic theory}, editor = {Wohlgemuth, Jan and Cysouw, Michael}, pages = {11-60}, publisher = {Berlin: Mouton De Gruyter}, title = {Rarities in numeral systems}, year = {2010} }