Stähle, Volker, Altherr, Rainer, Unrath, Günther, AND Varychev, Alexander. " Petrological studies of Middle Neolithic stone artefacts from the Salenhof archaeological site near Trillfingen (SW Germany) give evidence for an early diversified long-distance exchange system" Journal of Neolithic Archaeology [Online], Volume 20(14 February 2019)