Complex Analysis and Operator Theory (Complex Anal. Oper. Theory) (20220101), 16, no.~7, Paper No 106, 21~pp. ISSN: 1661-8254 (print).eISSN: 1661-8262.
Acta Mathematica Scientia. Series B. English Edition (Acta Math. Sci. Ser. B (Engl. Ed.)) (20220101), 42, no.~2, 774-788. ISSN: 0252-9602 (print).eISSN: 1572-9087.