Yan, Dun Yan et al., Weak-type Endpoint Estimates for Multilinear Singular Integral Operators, Acta mathematica Sinica. English series (Print) , 21(1), 2004, pp. 209-214
In this paper, the authors discuss a class of multilinear singular integrals and obtain that the operators are bounded from H 1 (n) to weak L 1 (n). Using this result, we can directly prove a main theorem in [5].