On Thursday,  1 Mar 2018 at 15:40, Joseph Vidal-Rosset wrote:

[...]

> Many thanks Eric! I suspected that there should be a simple solution,
> but I did not expected that it was so much simple!
>
> I am applying what you say in replying to you. And it works perfectly!

Excellent.  Glad I could help.

> I am going to define two keybindings for this and I would be happy if
> you could suggest to me how adding automatically this link
>
> [[bibliography:/home/joseph/MEGA/org/reforg.bib]]
>
> with the command M-x org-mode RET .

I am not sure I understand what you wish to do.  If it is to always add
that line to the message you are composing when you switch to org-mode,
the natural way would be through a hook but that hook would apply to any
other org files as well.  Alternatively, you could use the signature
methods in gnus?

In any case, I'm not sure what you would gain by adding that link to an
email as htmlize will not do anything reasonable with it?

-- 
Eric S Fraga via Emacs 27.0.50, Org release_9.1.7-466-ga16590