Logarithmic mean oscillation on the polydisc, endpoint results for   multi-parameter paraproducts, and commutators on BMO
  We study boundedness properties of a class of multiparameter paraproducts on the dual space of the dyadic Hardy space H_d^1(T^N), the dyadic product BMO space BMO_d(T^N). For this, we introduce a notion of logarithmic mean oscillation on the polydisc. We also obtain a result on the boundedness of iterated commutators on BMO([0,1]^2). 
Sandra Pott and Benoit Sehba
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