@inproceedings{göran1956distributions,
title={Distributions of positive mass, which maximize a certain generalized energy integral},
author={Göran Björck},
url={http://archive.ymsc.tsinghua.edu.cn/pacm_paperurl/20170108203420263308922},
booktitle={Arkiv for Matematik},
volume={3},
number={3},
pages={255-269},
year={1956},
}
Göran Björck. Distributions of positive mass, which maximize a certain generalized energy integral. 1956. Vol. 3. In Arkiv for Matematik. pp.255-269. http://archive.ymsc.tsinghua.edu.cn/pacm_paperurl/20170108203420263308922.