TRANSITION METAL OXIDE NANOMATERIALS: NEW WEAPONS TO BOOST ANTI-TUMOR IMMUNITY CYCLE




Measuring Gravity in International Trade Flows

The purpose of this paper is two-fold.One is to clarify the concept of gravity in international trade flows.The other is to measure the strength of gravity in international trade flows in a way that is consistent with a well-defined concept of gravity.This paper shows that the widely accepted belief that specialization is the source of gravity is n

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