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Google圖書搜尋
Some Results about the Curvature in Reimannian Spaces, in Particular about Surfaces of Curvature [less Than Or Equal To] K
Folke Eriksson
出版
Universitetet
, 1962
URL
http://books.google.com.hk/books?id=7PTlHAAACAAJ&hl=&source=gbs_api