Hu, Guo En et Ma, Bo Lin, L 2(n) Boundedness for the Commutators of Homogeneous Singular Integral Operators, Acta mathematica Sinica. English series (Print) , 20(5), 2004, pp. 785-792
The commutators of singular integral operators with homogeneous kernel (x)|x|n are studied, where is homogeneous of degree zero, and has mean value zero on the unit sphere. It is proved that L(logL)k*1(S n1) is a sufficient condition such that the k-th order commutator is bounded on L 2(n).