1. KPMG: Fashion 2025: Studie zur Zukunft des Fashion-Markts in Deutschland (2015)
2. Nielsen: Share of internet users who have ever purchased products online as of November 2016, by Category.
https://www.statista.com/statistics/276846/reach-of-top-online-retail-categories-worldwide/
3. Eurostat: E-commerce statistics for individuals: about two thirds of internet users in the EU shopped online in 2016.
http://ec.europa.eu/eurostat/statistics-explained/index.php/E-commerce_statistics_for_individuals
4. eMarketer Inc.: Retail ecommerce set to keep a strong pace through 2017.
https://www.emarketer.com/Article/Retail-Ecommerce-Set-Keep-Strong-Pace-Through-2017/1009836
5. Studer, R., Benjamins, R., Fensel, D.: Knowledge engineering: principles and methods. Data Knowl. Eng. 25, 161–197 (1998)