On Dehn's Lemma and the Asphericity of Knots
- 期刊名称Proceedings of the National Academy of Sciences of the United States of America
- 作者C. D. Papakyriakopoulos
- 卷第43卷
- 期第1期
- 印刷ISSN0027-8424
- 文件大小215.73KB
- 发表时间1957-04-15
- DOI10.2307/89628
- 页码169-172
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