citation call-outs separated with a semicolon

Question

I am using the following:

\citep[vgl. bspw. ][S. 380]{Bortz2006}\citep[S. 40]{Fayyad1996}\citep[S. 11]{Maimon2010}

to get the output:

[vgl. bspw. BD06, S. 380][FPSS96, S. 40][MR10, S. 11]

Is it possible to separated the citation with a semicolon and not with a square bracket, like this:

[vgl. bspw. BD06, S. 380; FPSS96, S. 40; MR10, S. 11]

Answer 1

I think you should replace

\citep[vgl.~bspw.][S.~380]{Bortz2006}\citep[S.~40]{Fayyad1996}\citep[S.~11]{Maimon2010}

with

\citetext{vgl. bspw. \citealp[S.~380]{Bortz2006}; \citealp[S.~40]{Fayyad1996}; 
\citealp[S.~11]{Maimon2010}}

Observe the use of \citetext and three \citealp instructions.

A full MWE (minimum working example):

\documentclass{article}
\usepackage[numbers]{natbib}
%\bibliographystyle{lni} 
\frenchspacing
\begin{document}

\citep[vgl.~bspw.][S.~380]{Bortz2006}\citep[S.~40]{Fayyad1996}\citep[S.~11]{Maimon2010}

\medskip
\citetext{vgl. bspw. \citealp[S.~380]{Bortz2006}; \citealp[S.~40]{Fayyad1996}; \citealp[S.~11]{Maimon2010}}

\begin{thebibliography}{99} % just for this example
\bibitem[BD06]{Bortz2006} stuff

\bibitem[FPSS96]{Fayyad1996} stuff

\bibitem[MR10]{Maimon2010} stuff
\end{thebibliography}
\end{document}