@article{CTT100652800,
  author = {Shoichi Fujimori and S.E. Koh and Y.W. Kim and Wayne Rossman and H. Shin and Hedenobu Takahashi and Masaaki Umehara and Kotaro Yamada and Seong-Deog Yang},
  title = {Zero mean curvature surface in L^3 containing a light-like line},
  journal = {C. R. Acad. Sxi. Paris, Ser. I},
  year = 2012,
}

@article{CTT100636109,
  author = {Shohei Shiba and Masaaki Umehara},
  title = {The behavior of curvature functions at cusps and inflection points},
  journal = {Differential Geometry and its applications},
  year = 2012,
}

@article{CTT100636108,
  author = {Kentaro Saji and Masaaki Umehara and Kotaro Yamada},
  title = {Coherent tangent bundles and Gauss-Bonnet formulas for wave fronts},
  journal = {Journal of Geometric Analysis},
  year = 2012,
}