@inproceedings{richard1979complete,
  title={Complete manifolds with nonnegative scalar curvature and the positive action conjecture in general relativity},
  author={Richard M Schoen, and Shing-Tung Yau},
  url={http://archive.ymsc.tsinghua.edu.cn/pacm_paperurl/20191224204153904565140},
  booktitle={Proceedings of the National Academy of Sciences},
  volume={76},
  number={3},
  pages={1024-1025},
  year={1979},
}
             
            
                
Richard M Schoen, and Shing-Tung Yau. Complete manifolds with nonnegative scalar curvature and the positive action conjecture in general relativity. 1979. Vol. 76. In Proceedings of the National Academy of Sciences. pp.1024-1025. http://archive.ymsc.tsinghua.edu.cn/pacm_paperurl/20191224204153904565140.