# equal contribution using thanks with llncs class

I am trying to add equal contribution footnote using the \thanks keyword.

\documentclass{llncs}

\usepackage{hyperref}

\begin{document}
\title{Some Title}

\author{Author1 \thanks{equal contribution} \and Author2 \footnotemark[1] \and Author3}
\institute{\email{email1, email2, email3} \\ Institute}
\maketitle

\end{document}


This gives me an error,

! Use of \@xfootnotenext does not match its definition

Any work around ?.

• The error is caused by \footnotemark, not by \thanks – egreg Mar 5 '18 at 13:59
• @egreg, I used footnotemark as a work around to get a single footnote for both authors (found in this post tex.stackexchange.com/questions/61303/…). Is there any work around to get one foot note for both authors ? – Shew Mar 5 '18 at 14:06
• That's not how llncs works, I'm afraid. – egreg Mar 5 '18 at 14:09

It seems that \footnotemark cannot be used in the \author field for llncs. Here's a workaround:

\documentclass{llncs}

\usepackage{hyperref}

\makeatletter
\newcommand{\printfnsymbol}[1]{%
\textsuperscript{\@fnsymbol{#1}}%
}
\makeatother

\begin{document}
\title{Some Title}

\author{Author1\thanks{equal contribution}
\and Author2\printfnsymbol{1} \and Author3}
\institute{\email{email1, email2, email3} \\ Institute}
\maketitle

\end{document}