Nothing
My publication list includes unknown (2013); Boettiger & Hastings (2012); Boettiger et. al. (2012); Boettiger et. al. (2012b); Boettiger & Hastings (2012b); Beaulieu et. al. (2012); Boettiger et. al. (2012c); Boettiger et. al. (2010); Wray et. al. (2006). Note how knitcitations
appends "a", "b", "c", to disambiguate otherwise identical references. Here's the full bibliography. (Note that the format includes the RDFa markup embedded around the citation text.)
Any scripts or data that you put into this service are public.
Add the following code to your website.
For more information on customizing the embed code, read Embedding Snippets.