@article{CTT100622197,
  author = {Kentaro Saji and Masaaki  Umehara and Kotaro Yamada},
  title = {Singularities of Blaschke normal maps of convex surfaces},
  journal = {C. R. Math. Acad. Sci. Paris},
  year = 2010,
}

@article{CTT100622193,
  author = {Kentaro Saji and Masaaki Umehara and Kotaro Yamada},
  title = {The duality between singular points and inflection points on wave fronts},
  journal = {Osaka J. Math.},
  year = 2010,
}