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The Concept of Variety in the Theory of Categories

I. NémetiTamás GergelyA. Pásztor

出版	Hungarian Academy of Sciences, Central Research Institute for Physics, 1975*
ISBN	96337106779789633710678
URL	http://books.google.com.hk/books?id=yc5zAAAACAAJ&hl=&source=gbs_api