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

Positive Solutions of Operator Equations AX = B, XC = D. - Haiyan Zhang; Yan-Ni Dou; Weiyan Yu (Axioms, 2024)