中国科学院数学与系统科学研究院期刊网
Estimates for Eigenvalues of Fourth-order Elliptic Operators in Divergence Form on Complete Riemanian Manifolds
Feng DU, Chuan Xi WU, Guang Han LI, Chang Yu XIA
Acta Mathematica Sinica, Chinese Series . 2015, (4): 635 -648 .  DOI: 10.12386/A2015sxxb0065