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https://econsultancy.com/blog/66322-do-companies-understand-the-customer-journey/
2. Simpson, J.: Only 17 % of Brands have the Ability to Fully Analyse the Customer Journey (2015).
https://econsultancy.com/blog/66913-only-17-of-brands-have-the-ability-to-fully-analyse-the-customer-journey/
3. Appleseed, J.: 6 Use Cases for Compatibility Databases on E-Commerce Sites (2015).
http://baymard.com/blog/ecommerce-compatibility-databases
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https://www.smashingmagazine.com/2014/08/the-current-state-of-e-commerce-search/
5. Holst, C.: The Current State of E-Commerce Filtering (2015).
https://www.smashingmagazine.com/2015/04/the-current-state-of-e-commerce-filtering/