@inproceedings{marcus2007the,
title={The local isometric embedding in $\ mathbb {R}^ 3$ of two-dimensional Riemannian manifolds with Gaussian curvature changing sign to finite order on a curve},
author={Marcus A. Khuri},
url={http://archive.ymsc.tsinghua.edu.cn/pacm_paperurl/20160908201117993448679},
booktitle={Journal of Differential Geometry},
volume={76},
number={2},
pages={249-291},
year={2007},
}

Marcus A. Khuri. The local isometric embedding in $\ mathbb {R}^ 3$ of two-dimensional Riemannian manifolds with Gaussian curvature changing sign to finite order on a curve. 2007. Vol. 76. In Journal of Differential Geometry. pp.249-291. http://archive.ymsc.tsinghua.edu.cn/pacm_paperurl/20160908201117993448679.