@article{10_4064_sm_39_1_39_58,
     author = {Calixto Calder\'on},
     title = {Conjugate kernels and convergence of harmonic singular integrals},
     journal = {Studia Mathematica},
     pages = {39--58},
     publisher = {mathdoc},
     volume = {39},
     number = {1},
     year = {1971},
     doi = {10.4064/sm-39-1-39-58},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/sm-39-1-39-58/}
}