https://sqlserverbiblog.wordpress.com/2011/03/27/designing-reports-with-custom-mdx-queries-part-1/
https://sqlserverbiblog.wordpress.com/2011/05/04/designing-reports-with-custom-mdx-queries-part-2/
https://sqlserverbiblog.wordpress.com/2011/05/04/designing-reports-with-custom-mdx-queries-part-3/