@article{CTT100755406,
  author = {Shoichi Fujimori and Yu Kawakami and Masatoshi Kokubu and Wayne Rossman and Masaaki Umehara and Kotaro Yamada},
  title = {Zero mean curvatrue entire graphs of mixed type in Lorentz-Minkowski 3-space},
  journal = {The Quarterly Journal of Mathematics},
  year = 2016,
}