@article{CTT100836963,
  author = {Akamine Shintaro and Masaaki Umehara and Kotaro Yamada},
  title = {Improvement of the Bernstein-type theorem for space-like zero mean curvature graphs in Lorentz-Minkowski space using fluid mechanical duality},
  journal = {Proc. Amer. Math. Soc. Ser. B},
  year = 2020,
}

@article{CTT100836989,
  author = {S. Akamine and A. Honda and M. Umehara and K.Yamada},
  title = {Bernstein-type theorem for zero mean curvature hypersurfaces without time-like points in Lorentz-Minkowski space},
  journal = {Bulletin of the Brazilian Mathematical Society, New Series},
  year = 2020,
}