“40 years riegl —hightech from austria; [40 Jahre Riegl – Hightech aus Österreich]”, gis.Business | issn : 1869-9286, vol. 19, no. 1, pp. 24–30, Jan. 2018, Accessed: Nov. 09, 2026. Available: https://journal-gis.business/index.php/gisb/article/view/398