@article{CTT100636104,
  author = {Kentaro Saji and Masaaki Umehara and Kotaro Yamada},
  title = {A_2-singularities of hypersurfaces with non-negative sectional curvature in Euclidean space},
  journal = {Kodai Math. J.},
  year = 2011,
}

@article{CTT100636105,
  author = {Shoichi Fujimori and Yu Kawakami and Masatoshi Kokubu and Wayne Rossman and M. Umehara and Kotaro Yamada},
  title = {CMC-1 trinoids in H3 and metrics of constant curvature one with conical singularities on S^2},
  journal = {Prooc. Japan Academy Ser. A},
  year = 2011,
}

@article{CTT100622192,
  author = {Masaaki Umehara and Kotaro Yamada},
  title = {Applications of a completeness lemma in minimal surface theory to various classes of surfaces},
  journal = {Bull. Lond. Math. Soc.},
  year = 2011,
}

@article{CTT100815684,
  author = {Liu, H. and Umehara, M. and Kotaro Yamada},
  title = {The duality of conformally flat manifolds},
  journal = {Bulletin of the Brazilian Mathematical Society},
  year = 2011,
}