Under the assumption that μ is a non-doubling measure on ℝd, the authors obtain the boundedness of commutators generated by Calderón-Zygmund operators or fractional integrals with Lipschitz functions ...

We show that the product BMO space can be characterized by iterated commutators of a large class of Calderón–Zygmund operators. This result follows from a new proof of boundedness of iterated ...