@article{JEMS_2009_11_2_a1,
     author = {Pertti Mattila and Joan Verdera},
     title = {Convergence of singular integrals with general measures},
     journal = {Journal of the European Mathematical Society},
     pages = {257--271},
     publisher = {mathdoc},
     volume = {11},
     number = {2},
     year = {2009},
     doi = {10.4171/jems/149},
     url = {http://geodesic.mathdoc.fr/articles/10.4171/jems/149/}
}