@techreport{Sander2014,
author = {Sander, N. and Abel, G.J. and Bauer, R. and Schmidt, J.},
title= {Visualising migration flow data with circular plots},
year = {2014},
URL = {https://www.oeaw.ac.at/fileadmin/subsites/Institute/VID/PDF/Publications/Working_Papers/WP2014_02.pdf},
institution = {Vienna Institute of Demography Working Papers 2/2014},
}