“…When b ∈ BMO, Krantz and Li [4] discussed the L p boundedness of T b on the homogeneous space. The commutator generated by a fractional integral operator and a locally integrable function b can be regarded as a special case of the generalized Toeplitz operator Θ b α0 = m j=1 (T j,1 M b I α0 T j,2 + T j, 3 4 ), where T j,1 are the Calderón-Zygmund operators or ±I, T j,2 , T j, 4 are the bounded linear operators on L p , T j, 3 …”