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Hi Johannes_B,

Thank you for your help. I was making a stupid mistake, instead of exporting the latex file, I was instead exporting a pdf (pdflatex).

Hi Stefen_K,

I'm sorry for the late reply but I had been very busy lately.

As suggested, attached you can find all the files required.

Kind regards,
Bruno

Hi Stefan_k,

Thank you for your help. I'm very grateful that you can suggest me some tips to fix it.
I Changed the preamble for what you suggested, however it resulted in a very strange situation.
My citations appears with the bibtexkey and no bibliography is plotted at the end of the chapter ...

dear all,

I'm wtitting my PhD thesis in lyx and I figure out that using biblatex is the simplest way to have a bibliography per chapter. I follow all the intructions I found in the forum to have it working.
My lyx file works fine, however my bibliography in every chapter shows all the citations of ...