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Useful notes for some of my answers:

CTAN lion drawing by Duane Bibby.

How do you accept an answer?](http://meta.tex.stackexchange.com/q/1852/3954)

minimal working example](http://www.minimalbeispiel.de/mini-en.html)

The demo option for graphicx simply replaces actual figures with black rectangles; do not use that option in your actual document.


Jun
17
comment Right aligning two columns next to each other in longtable
@maraujop You're welcome! Regarding your question, you can use \multicolumn to override the column type specification for the headers: \multicolumn{1}{|c|}{header1} & \multicolumn{1}{c|}{header2} & \multicolumn{1}{c|}{header3} & \multicolumn{1}{c|}{header4} \\ .
Jun
17
answered Right aligning two columns next to each other in longtable
Jun
17
answered lstlisting in a tabular enviroment
Jun
17
awarded  Enlightened
Jun
17
awarded  Nice Answer
Jun
17
awarded  Nice Question
Jun
17
awarded  Enlightened
Jun
17
awarded  Nice Answer
Jun
17
revised How to design a command inquiring internally required packages?
added information
Jun
17
comment Undefined citations
So you are using some packages. That's why I asked for a minimal document with the relevant settings and allowing us to reproduce the problem mentioned. Without this information is really hard to provide effective help. Edit the question, and make sure you include all relevant settings.
Jun
17
revised How to design a command inquiring internally required packages?
fixed spelling
Jun
17
comment Undefined citations
then the problem is elsewhere. Do you have any problems in your document after adding the \bibliographystyle{...} line?
Jun
17
asked How to design a command inquiring internally required packages?
Jun
17
revised ChangingTikz Node Style works only once in Beamer
added animation
Jun
17
answered ChangingTikz Node Style works only once in Beamer
Jun
17
comment Undefined citations
@Please do a test using the example document on my answer below. Save the file exactly as it is as, for example, mybibtest.tex, and then run pdflatex+bibtex+pdflatex+pdflatex. Do you get the same result as in the image I attached or do you get error(s)/warning(s)? Please report the outcome.
Jun
16
comment Undefined citations
Almost :-) You said you were using natbib, but your minimal code doesn't load natbib. Also, you didn't include the style used (the line with \bibliographystyle{...}).
Jun
16
revised Undefined citations
code formatting
Jun
16
revised Basic geometric shapes, sections, shading
new simplified code
Jun
16
comment Undefined citations
You forgot to add the offending entry of the .bib file.