@inproceedings{christopher2006decomposable,
title={Decomposable symmetric mappings between infinite-dimensional spaces},
author={Christopher Boyd, and Silvia Lassalle},
url={http://archive.ymsc.tsinghua.edu.cn/pacm_paperurl/20170108203621991508933},
booktitle={Arkiv for Matematik},
volume={46},
number={1},
pages={7-29},
year={2006},
}

Christopher Boyd, and Silvia Lassalle. Decomposable symmetric mappings between infinite-dimensional spaces. 2006. Vol. 46. In Arkiv for Matematik. pp.7-29. http://archive.ymsc.tsinghua.edu.cn/pacm_paperurl/20170108203621991508933.