latex newcommand で複数の引数を取る

http://tex.stackexchange.com/questions/147642/how-to-create-new-commands-with-multiple-arguments

\newcommand{\add}[2]{\textit{#1} {`#2'}}
aaai.styで
\newcommand{\newcite}[1]{\citeauthor{#1} (\citeyear{#1})}