@inproceedings{david2013the,
title={THE GEOMETRIC CAUCHY PROBLEM FOR SURFACES WITH LORENTZIAN HARMONIC GAUSS MAPS},
author={David Brander, and Martin Svensson},
url={http://archive.ymsc.tsinghua.edu.cn/pacm_paperurl/20160914073025879520955},
booktitle={Journal of Differential Geometry},
volume={93},
number={1},
pages={37-66},
year={2013},
}

David Brander, and Martin Svensson. THE GEOMETRIC CAUCHY PROBLEM FOR SURFACES WITH LORENTZIAN HARMONIC GAUSS MAPS. 2013. Vol. 93. In Journal of Differential Geometry. pp.37-66. http://archive.ymsc.tsinghua.edu.cn/pacm_paperurl/20160914073025879520955.