“Intergeo celebrates a convincing comeback in Essen; [Intergeo feiert überzeugendes Comeback in Essen]” (2022) gis.Business | issn : 1869-9286, 23(1), pp. 52–54. Available at: https://journal-gis.business/index.php/gisb/article/view/449 (Accessed: 8 November 2026).