“Requirements for the German Retail Horticulture from an Economic Perspective. A Qualitative Approach in the Context of Service Controlling”, GJSFR, vol. 17, no. D4, pp. 13–25, Sep. 2017, Accessed: Aug. 13, 2026. [Online]. Available: https://www.journalofscience.org/index.php/GJSFR/article/view/2069