@inproceedings{sergey2012banach,
title={Banach analytic sets and a non-linear version of the Levi extension theorem},
author={Sergey Ivashkovich},
url={http://archive.ymsc.tsinghua.edu.cn/pacm_paperurl/20170108203636763909054},
booktitle={Arkiv for Matematik},
volume={52},
number={1},
pages={149-173},
year={2012},
}

Sergey Ivashkovich. Banach analytic sets and a non-linear version of the Levi extension theorem. 2012. Vol. 52. In Arkiv for Matematik. pp.149-173. http://archive.ymsc.tsinghua.edu.cn/pacm_paperurl/20170108203636763909054.