Is the Keflavik airport in Reykjavik a node in the European or the North American air-traffic network, or in both? The answer should depend on the passenger flow through the airport, says one's intuition. Using ideas from information theories, Viamontes Esquivel and Rosvall from Sweden turn this intuition into a method for identifying operational modules in a functional network and resolving their overlap.
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A 2011 study studied this question.