Michael Cysouw Søren Wichmann David Kamholz A critique of the separation base method for genealogical subgrouping, with data from mixe-zoquean. 225-264 2006 13 Journal of Quantitative Linguistics 2-3 http://dx.doi.org/10.1080/09296170600850759 db/journals/jql/jql13.html#CysouwWK06