論文

• Atsufumi Honda, Kosuke Naokawa, Kentaro Saji, Masaaki Umehara, Kotaro Yamada. On the existence of four or more curved foldings with common creases and crease patterns, Beiträge zur Algebra und Geometrie / Contributions to Algebra and Geometry, Oct. 2021.  公式リンク  
  
• Masaaki Umehara, Kotaro Yamada. Hypersurfaces with light-like points in a Lorentzian manifold II, Kodai Math. J., Vol. 44, No. 1, Mar. 2021.

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