TY - Acta mathematica scientia,Series A A1 - Lin Li, Alatancang T1 - Essential and Weyl Spectra of 2×2 Bounded Block Operator Matrices Y1 - 2019-06-26 JF - Acta mathematica scientia, Series A JO - Acta mathematica scientia,Series A SP - 431 EP - 440 VL - 39 IS - 3 UR - http://121.43.60.238/sxwlxbA N1 - ER -