中国科学院数学与系统科学研究院期刊网
AMS
Accretivity of the General Second Order Linear Differential Operator
V. G. MAZ’YA, I. E. VERBITSKY
Acta Mathematica Sinica . 2019, (6): 832 -852 .  DOI: 10.1007/s10114-019-8127-9