O. Köster, R. Kehrein, K. Masthoff, and Y. H. Boubaker, “The tell-tale accent: Identification of regionally marked speech in German telephone conversations by forensic phoneticians”, IJSLL, vol. 19, no. 1, pp. 51–71, Jun. 2012, doi: 10.1558/ijsll.v19i1.51.