XML for Analysis Specification, Version 1.1 [doc]. Published by Microsoft Corporation and Hyperion Solutions Corporation. Updated: 11/20/2002
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Wikipedia information on XML for Analysis.
The BI Verdict (formerly The OLAP Report) is an independent research resource for organizations buying and implementing OLAP applications.
www.businessintelligence.com is a comprehensive resource website that provides readers with news, features and special reports covering all aspects of Business Intelligence.
MSDN’s OLE DB Programmer's Guide describes the functional advantages of using OLE DB for OLAP to access multi-dimensional and relational databases.
"MDX Solutions: with Microsoft SQL Server Analysis Services 2005 and Hyperion Essbase, Second Edition" (paperback), by George Spofford, Sivakumar Harinath, Christopher Webb, Dylan Hai Huang, Francesco Civardi. ISBN: 0-471-74808-0