@inproceedings{c.1989a,
title={A unique continuation theorem for second order parabolic differential operators},
author={C. D. Sogge},
url={http://archive.ymsc.tsinghua.edu.cn/pacm_paperurl/20170108203532311687533},
booktitle={Arkiv for Matematik},
volume={28},
number={1},
pages={159-182},
year={1989},
}
C. D. Sogge. A unique continuation theorem for second order parabolic differential operators. 1989. Vol. 28. In Arkiv for Matematik. pp.159-182. http://archive.ymsc.tsinghua.edu.cn/pacm_paperurl/20170108203532311687533.