Patrick Dupre wrote:
> Thank for the idea. However,
> if I declare \usepackage[style=authoryear,natbib=true]{biblatex}
> after
>  \usepackage[sort, compress]{natbib} 
> 
> there is a conflict

Sure, you have to decide which approach you want to use, you cannot use both.

> If I remove 
> \usepackage[sort, compress]{natbib} 
> then I cannot use
> \bibliographystyle{unsrt}
> If would like keep using Bibtex generated bibliography.

OK, so you are NOT using biblatex. Then you will need to copy and edit the 
style file unsrt.bst. Note, though, that "unsrt" is not really compatible with 
natbib, you should rather use "unsrtnat".

So, make a copy of unsrtnat.bst, say unsrtnat-notitle.bst. In this file, 
change the following method:

FUNCTION {format.title}
{ title empty$
    { "" }
    { title "t" change.case$ }
  if$
}

to

FUNCTION {format.title}{ "" }

Make sure the file unsrtnat-notitle.bst is in your texmf tree. In LyX, issue 
"rescan" in the bibtex dialog, then you should be able to chose "unsert-
notitle".

HTH
Jürgen

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