@inproceedings{tomas1980analytic,
  title={Analytic ramifications and flat couples of local rings},
  author={Tomas Larfeldt, and Christer Lech},
  url={http://archive.ymsc.tsinghua.edu.cn/pacm_paperurl/20170108203253884484293},
  booktitle={Acta Mathematica},
  volume={146},
  number={1},
  pages={201-208},
  year={1980},
}
             
            
                
Tomas Larfeldt, and Christer Lech. Analytic ramifications and flat couples of local rings. 1980. Vol. 146. In Acta Mathematica. pp.201-208. http://archive.ymsc.tsinghua.edu.cn/pacm_paperurl/20170108203253884484293.