I'm currently writing my thesis on LyX 2.1 with the template of Matthieu Perreira Da Silva. This uses the thl3i.bst bibliography template. The template is too big for me to paste the code here but it is in the zip file available following the link.
Let's consider a reference "NameA, NameB, 2001..." that I want to cite. If I let all bibliography parameters as "implicit" in LyX, I get citations like [NameA 01]. However, I want it to be [NameA et al. 2001] and I don't know how to do that. I tried using natbib with "Author-year", but then I get a "Package natbib Error: Bibliography not compatible with author-year citations" error, while there is no year/author missing from my .bib file.
Is there a way to get the format I want?
Is there also a way to add new formats accessibles by LyX (I would prefer to use LyX's citation tool instead of LaTeX to make my citations)? I would like to add "AuthorA et al. " and "AuthorA et al." as I tend to use both when writing