Why do I need to run latex/bibtex three times to make everything look good?

Why does latex need to be executed 3 times like following? pdflatex main.tex bibtex main pdflatex main.tex pdflatex main.tex Copied from https://tex.stackexchange.com/questions/53235/why-does-latex-bibtex-need-three-passes-to-clear-up-all-warnings. The reason is as follows: 1, At the first latex run, all cite{…} arguments are written in the file document.aux. 2, At the bibtex run, this information is taken by bibtex and the […]