The Arithmetic of Elliptic Curves
《The Arithmetic of Elliptic Curves》 · 第 332 页 · Chapter X，Section 4「The Selmer and Shafarevich–Tate Groups」，Definition
Let $\phi:E/K\to E'/K$ be an isogeny. The $\phi$-Selmer group of $E/K$ is the subgroup of $H^1(G_{\overline K/K},E[\phi])$ defined by $S^{(\phi)}(E/K)=\ker\bigl(H^1(G_{\overline K/K},E[\phi])\to\prod_{v\in M_K}WC(E/K_v)\bigr)$.