I meant 

https://bibbase.org/show?bib=http%3A%2F%2Fwww.lamsade.dauphine.fr%2F~ocailloux%2FCailloux.bib&theme=default

Thinking a bit more about this, it would be nice to distinguish visually categories of links. Some links refer to articles; some to presentations (slides); some to yet something else (source code on GitHub, web site of the conference, …). These should not be tied to formats: a PDF format may be used for multiple categories, and an article may be published under (in principle) a variety of formats (word, …).

I think arXiv or other publishers are correct in providing links that do not mention the format, thereby implementing a recommendation of Tim Berners-Lee: in a later version of a given article, I might decide to change the format; the URL should not (or not necessarily) depend on that choice.

If you agree with this reasoning, it would be nice if BibBase could provide three icons, for the three categories just mentioned, with a possibility for authors to indicate in their bibliographic source which category each URL belongs to. Authors could use any category they want, with two categories (“article” and “presentation”) being associated to the corresponding icons, and other categories being associated to the “default” icon (as currently non-PDF links are) and requiring edition of the CSS for specification of different icons.

For an example with multiple link categories, see here.