@inproceedings{mu-tao2004interior,
title={Interior gradient bounds for solutions to the minimal surface system},
author={Mu-Tao Wang},
url={http://archive.ymsc.tsinghua.edu.cn/pacm_paperurl/20160822230209910943385},
booktitle={American Journal of Mathematics },
volume={126},
number={4},
pages={921-934},
year={2004},
}

Mu-Tao Wang. Interior gradient bounds for solutions to the minimal surface system. 2004. Vol. 126. In American Journal of Mathematics . pp.921-934. http://archive.ymsc.tsinghua.edu.cn/pacm_paperurl/20160822230209910943385.