Displaying hyperlinks in Doxygen HTML content

I have been using Doxygen to generate HTML reference content, based on comment text drawn from comments in C# header files.

I have been including a hyperlink to a PDF document in many of these comments, drawn from a public web site. The text I include with the comment describing the PDF document appears fine, but the HTML files that Doxygen generates never show the associated hyperlink.  The HREF reference statement is simply ignored.

Any ideas why this is happening?

I am using Doxygen version 1.5.2. Is that the problem?

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