@article{AIF_1981__31_1_257_0,
     author = {Varopoulos, Nicolas Th.},
     title = {A theorem on weak type estimates for {Riesz} transforms and martingale transforms},
     journal = {Annales de l'Institut Fourier},
     pages = {257--264},
     publisher = {Institut Fourier},
     address = {Grenoble},
     volume = {31},
     number = {1},
     year = {1981},
     doi = {10.5802/aif.826},
     mrnumber = {84e:60070},
     zbl = {0437.60003},
     language = {en},
     url = {http://archive.numdam.org/articles/10.5802/aif.826/}
}