CiteSeer document pages now link to ACM Portal records plus DBLP. The new feature is available from an "ACM" link in the document header when the ACM metadata can be found. For an example of its location, please see the image below.
 ACM Portal and DBLP links are also generated for citations in document summary pages as well as for citation search results. Please see the following images for examples. 
New links in citation search results: 
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