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2. blog.sqlauthority
https://blog.sqlauthority.com/2007/03/30/sql-server-index-seek-vs-index-scan-table-scan/
post from 30 March 2007
3. http://searchsqlserver.techtarget.com/definition/database
4. i-manager’s J. Inf. Technol. 2l(11) December 2012–February 2013 Timur Mirosoev and Craig Brockman. Sap Hana and its performance benefits
5. https://www.cs.usfca.edu/~galles/visualization/BTree.html