Before revision: Gravity, pressure and molecular cohesion were the focus of work in 2010 by Hughes at the Queensland University of Technology.
After revision: <ref>cite journal|last1=Potter|first1=A.|last2=Barnes|first2=F.H.|title=The siphon|journal=Physics Education |date=1 September 1971|volume=6|issue=5|pages=362–366|doi=10.1088/0031-9120/6molecular cohesion were the focus of work in 2010 by Hughes at the Queensland University of Technology.