In Tate's local duality theorem we find the isomorphism $H^2(K, Q_p(1)) \cong Q_p$ where $K$ is a finite extension of $Q_p$. I haven't found any reference where this isomorphism is given explicitly (Only Kato's article in "Grothendieck Festchrift). Can anyone give me some reference or explicit this isomorphism please?
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