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Thank you for the suggestions, Johannes_B!

After trying further I found out that singlecol-new caused problems. Strange that it was provided by the editorial. I found another class to use.

Here come the files that I use. They have been shortened, still the problem remains. I used the templates from Inderscience Publishers, specifically the 9.5x6.5 LaTeX format.

Hello!

Now I am using TeXworks for writing. I have problems with the bibliography. A typical error looks like the following

At first there is a warning.
LaTeX Warning: Citation `holm1967' on page 13 undefined on input line 919.
Later come an error.
! Undefined control sequence.
l.28 \bibitem ...