Livingston, Jill, Deborah Sanford, Dave Bretthauer: A Comparison of OpenURL link resolvers: the results of a University of Connecticut Libraries environmental scan. Library collections, acquisitions & technical services 30 (2006), 179-201. 
Article on line

Mark G. Stengel, Using SFX to identify unexpressed user needs.  Collection management 29(2) (2004), 7-14. 
Article on line