Because broadcasting is a fairly specialized problem, there are few web sites dedicated to the problem. Hopefully, the following should be somewhat helpful.

Research Group on Graph Theory and Combinatorics -- Contains information about graph theory, with applications to computer networks.

The Directory of Computing Science Journals -- A good resource for looking up journal articles.

Technical Report Archives in Computer Science (By Institution) -- Maintained by Simon Fraser University, this page has links to technical reports, many of which can be downloaded.
 

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