deletions | additions       diff --git a/Swimmers.tex b/Swimmers.tex  index 71d631c..a2b62fa 100644  --- a/Swimmers.tex  +++ b/Swimmers.tex 
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\item Then consider a single active swimmer in a concentration gradient. Get superposition of two behaviours?  \begin{itemize}  \item Re-read \citet{http://adsabs.harvard.edu/abs/2005PhRvL..94v0801G} \citet{http://adsabs.harvard.edu/abs/2005PhRvL..94v0801G}. Read \citet{http://adsabs.harvard.edu/abs/2009JPCM...21t4104G}.  \end{itemize}  \end{enumerate}