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4. Evolution of Graphical User Interface in last 50 years by Raj Lal
5. The men who really invented the GUI by Clive Akass
6. https://www.knowi.com/mongodb-analytics?gclid=Cj0KCQjwl4v4BRDaARIsAFjATPmMqKOlMZD5hR-_qW7OZz8s1gFYizNEzf9TnbYas7PdSY1SjfRUooUaAnF9EALw_wcB
7. https://adamfowler.org/2017/11/30/why-nosql-needs-schema-free-etl-tools/?0
8. https://www.kdnuggets.com/2014/08/top-10-references-applying-big-data-analytics-business.html