“Riegl Lidar 2015 - A Follow-up Report; [Riegl Lidar 2015 - Ein Nachbericht]”. Gis.Business | Issn : 1869-9286, vol. 16, no. 1, Jan. 2015, pp. 23-24, https://journal-gis.business/index.php/gisb/article/view/503.