Can't change the style of my bibliography

I have problems with my bibliography, currently I am using bibtex entries like this:

    @article{Tay,
author = {F. E. H. Tay; L. J. Cao},
title = {Improved financial time series forecasting by
combining Support Vector Machines with
self-organizing feature map},
journaltitle = {Intelligent Data Analysis},
date = {2001},
volume = {5},
pages = {339-354},
}


But for some reason it compiles into

F. E. H. Tay; L. J. Cao. Improved financial time series forecasting by combining support vector machines with self-organizing feature map. 5:339–354.


There is no year and journaltitle! And this is my problem, I need them.

Currently I am using

\bibliographystyle{plain}


but changing it to other styles had no effect at all, I mean there was no change in bibliography entries, for some reason this command just do not work.

It would be nice, if anyone could somehow help me to resolve this problem. I am using TexStudio.

• Have you tried changing the name of the date field to year, and journaltitle to journal? (After making the changes, be sure tu rerun bibtex and then LateX twice more to fully propagate the change.) Incidentally, you should use 'and as the separator between authors. – Mico May 10 '15 at 22:46
• If you change the style in your Latex file, you need to run latex, then run bibtex, then run latex again before you will see any change... – Thruston May 10 '15 at 22:47
• @Thruston - that's good advice. However, since the plain bibliography style doesn't recognize the field names date and journal, it won't help the OP all that much. – Mico May 10 '15 at 22:49
• Thanks a lot, Mico! Your advice helped to solve the issue, and thank you for suggestion on using 'and', now my bibliography is sorted properly. Is there any way to say you thanks by +rep or something like this? Or at least mark your comment as helpful? – nooby May 10 '15 at 22:56
• How about if I re-post my comment as an answer? :-) You can then accept and/or upvote it. – Mico May 10 '15 at 23:24

BibTeX's plain bibliography style as well as virtually all other BibTeX-based bibliography styles do not recognize -- and hence do not process -- fields named date and journaltitle. Use year and journal instead.

Separately, you should use the keyword and as the separator between authors. The term and is a keyword in author fields; don't use ; (semicolon).

The result of a full MWE:

\documentclass{article}
\usepackage{filecontents}
\begin{filecontents}{demobib.bib}
@article{Tay,
author  = {F. E. H. Tay and L. J. Cao},
title   = {Improved financial time series forecasting by
combining Support Vector Machines with
self-organizing feature map},
journal = {Intelligent Data Analysis},
year    = {2001},
volume  = {5},
pages   = {339-354},
}
\end{filecontents}
\bibliographystyle{plain}

\begin{document}
\cite{Tay}
\bibliography{demobib}
\end{document}
`