MathSciDoc: An Archive for Mathematician ∫

@inproceedings{johan1973$k$-theory,
  title={$K$-theory obstructions to the existence of vector fields},
  author={Johan L. Dupont},
  url={http://archive.ymsc.tsinghua.edu.cn/pacm_paperurl/20170108203232871726175},
  booktitle={Acta Mathematica},
  volume={133},
  number={1},
  pages={67-80},
  year={1973},
}