Polygons have been compiled by Gerd Carling, Josien Greidanus, Astrid Zimmerman, and controlled by Elnur Aliyev and Karina Vamling. Thanks also to Karin Larsson and Lund University GIS Centre for support.
Literary sources to polygons will be available in this publication: Carling, Gerd 2019 (ed.) Mouton Atlas of Languages and Cultures. Vol. 1. Europe and West, Central, and South Asia. Berlin - New York: Mouton de Gruyter.
Funding has been provided by Marcus and Amalia Wallenberg Foundation and Crafoord Foundation.
Rules for usage: The polygons can be used for research and non-commercial publication, quoting the following source:
Carling, Gerd (ed.) 2017. Diachronic Atlas of Comparative Linguistics Online. Lund: Lund University. (DOI/URL: https://diacl.ht.lu.se/. Accessed on: x.).
N.B.: This homepage, www.gerdcarling.se should not be used as a source for the polygons.