Liesen, Bernd. “Lowlands Ware 1 Containers from Xanten Colonia Ulpia Traiana”. Rei Cretariae Romanae Fautorum Acta, vol. 44, Jan. 2017, pp. 389-96, https://archaeopresspublishing.com/ojs/index.php/RCRF/article/view/2053.