@article{EschenburgFerreiraTribuzy2007,
  author    = {Jost-Hinrich Eschenburg and M. J. Ferreira and Renato Tribuzy},
  title     = {Isotropic ppmc immersions},
  journal   = {Differential Geometry and its Applications},
  volume    = {25},
  number    = {4},
  pages     = {351 -- 355},
  doi       = {10.1016/j.difgeo.2007.02.005},
  year      = {2007},
}