@article{10_4064_sm_57_1_97_101,
     author = {A. Cordoba and C. Fefferman},
     title = {A weighted norm inequality for singular integrals},
     journal = {Studia Mathematica},
     pages = {97--101},
     publisher = {mathdoc},
     volume = {57},
     number = {1},
     year = {1976},
     doi = {10.4064/sm-57-1-97-101},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/sm-57-1-97-101/}
}