SOME PACKAGES
package{natbib}
% OBS!: plainnat style has conflict with C style multi-line comments /* */.
% OBS!: plainnat request zotero to export records as bibTex, not bibLatex.
\usepackage{natbib}
\cite Aaa et al. (2002)
\citet == \cite
\citet* Aaa, Bbb and Ccc (2002)......