@article{CTT100684944,
  author = {Shoichi Fujimori and Young Wook  Kim and Sung-Eun  Koh and Wayne Rossman and Heayong  Shin and Masaaki Umehara and Kotaro Yamada and Seong-Deog Yang},
  title = {Zero mean curvature surfaces in Lorentz-Minkowski 3-space and 2-dimensional fuluid mechanics},
  journal = {Math. J. Okayama Univ.},
  year = 2015,
}

@article{CTT100684946,
  author = {Shoichi Fujimori and Young Wook  Kim and Sung-Eun  Koh and Wayne Rossman and Heayong  Shin and Masaaki Umehara and Kotaro Yamada and Seong-Deog Yang},
  title = {Zero mean curvature surfaces in Lorentz-Minkowski 3-space which change type across a light-like line},
  journal = {OSAKA JOURNAL OF MATHEMATICS},
  year = 2015,
}