@article{IM_1974__23_142260,
     author = {Christian Berg and Jens P.R. Christensen},
     title = {Sur la norme des op\'erateurs de convolution.},
     journal = {Inventiones mathematicae},
     pages = {173--178},
     publisher = {mathdoc},
     volume = {23},
     year = {1974},
     zbl = {0261.22009},
     url = {http://geodesic.mathdoc.fr/item/IM_1974__23_142260/}
}