Finite Element Methods for Maxwell's Equations
《Finite Element Methods for Maxwell's Equations》 · 第 268 页 · Section 13.4「Short Intervals」
Lemma 13.6 (van der Corput). The estimates (13.48) hold with $(\alpha,\beta)=\left(\frac1{2^k-2},\frac{k+1}{2^k-2}\right)$ for every integer $k\ge2$.