@inproceedings{david2011axial,
  title={AXIAL MINIMAL SURFACES IN $S^2 x R$ ARE HELICOIDAL},
  author={David Hoffman, and Brian White},
  url={http://archive.ymsc.tsinghua.edu.cn/pacm_paperurl/20160912072525365553874},
  booktitle={Journal of Differential Geometry},
  volume={87},
  number={3},
  pages={515-523},
  year={2011},
}
             
            
                
David Hoffman, and Brian White. AXIAL MINIMAL SURFACES IN $S^2 x R$ ARE HELICOIDAL. 2011. Vol. 87. In Journal of Differential Geometry. pp.515-523. http://archive.ymsc.tsinghua.edu.cn/pacm_paperurl/20160912072525365553874.