@inproceedings{mariano1981on,
title={On the regularity of the minima of variational integrals},
author={Mariano Giaquinta, and Enrico Giusti},
url={http://archive.ymsc.tsinghua.edu.cn/pacm_paperurl/20170108203256564616312},
booktitle={Acta Mathematica},
volume={148},
number={1},
pages={31-46},
year={1981},
}
Mariano Giaquinta, and Enrico Giusti. On the regularity of the minima of variational integrals. 1981. Vol. 148. In Acta Mathematica. pp.31-46. http://archive.ymsc.tsinghua.edu.cn/pacm_paperurl/20170108203256564616312.