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Название: Quaternionic algebra and sheaves on the Riemann sphere
Автор: Quillen D.
Recently Joyce  has developed a theory of quatcrnionic algebra based on the notion of augmented H-moduIe, or АН-module. He constructs an associative and commutative tensor product operation for these modules, making them into a tensor category. He also distinguishes a class of stable АН-modules with nice properties with respect to this tensor product.