I am preparing a job and for this I need to use keys in equation mode as follows:
\begin{equation}
\Delta \eta_{i,j} =
\begin{cases}
\eta_{i,j},& se\quad aresta\quad i,j\quad foi\quad utilizada \
0, & se\quad aresta\quad i,j\quad n\tilde{a}o\quad foi\quad utilizada
\end{cases}
\label{eq5}
\end{equation}
For this I need to use the
\usepackage{amsmath}
However, when I use this package (I already did the test including and removing it, it is the one who generates the error) in the command call
\bibliography{referencias}
To generate my references the section title goes wrong. This way
7 *
Referências
No formatting whatsoever. It was not to be numbered even this section.
Can anyone help me? I do not know what's going on.