Persistent URIs Must Be Used To Be Persistent
  We quantify the extent to which references to papers in scholarly literature use persistent HTTP URIs that leverage the Digital Object Identifier infrastructure. We find a significant number of references that do not, speculate why authors would use brittle URIs when persistent ones are available, and propose an approach to alleviate the problem. 
Herbert Van de Sompel and Martin Klein and Shawn M. Jones
cs.DL