On the boundary of numerical ranges of operators. - Hai-Yan Zhang; Yan-Ni Dou; Mei-Feng Wang; Hong-Ke Du (Appl. Math. Lett., 2011)

A generalization of Schrödinger's uncertainty relation described by the Wigner-Yanase skew information. - Qian Li; Huai-Xin Cao; Hong-Ke Du (Quantum Inf. Process., 2015)