@inproceedings{audun1975embedding-obstruction,
title={Embedding-obstruction for singular algebraic varieties in$P$^{$N$}},
author={Audun Holme},
url={http://archive.ymsc.tsinghua.edu.cn/pacm_paperurl/20170108203237208553193},
booktitle={Acta Mathematica},
volume={135},
number={1},
pages={155-185},
year={1975},
}
Audun Holme. Embedding-obstruction for singular algebraic varieties in$P$^{$N$}. 1975. Vol. 135. In Acta Mathematica. pp.155-185. http://archive.ymsc.tsinghua.edu.cn/pacm_paperurl/20170108203237208553193.