Navigation auf uzh.ch
A new paper by Balthasar Bickel on testing hyoptheses about large and ancient linguistic areas will appear in a volume edited by M. Crevels, J.-M. Hombert & P. Muysken "Language dispersal, diversification, and contact: a global perspective” in 2016.
http://www.ivs.uzh.ch/bickel-files/papers/Ancient_areasBickel2015.pdf