@article{10_1090_S0894_0347_1989_0986825_6,
     author = {Coifman, R. R. and Jones, Peter W. and Semmes, Stephen},
     title = {Two elementary proofs of the {{\dh}{\textquestiondown}\^A{\texttwosuperior}} boundedness of {Cauchy} integrals on {Lipschitz} curves},
     journal = {Journal of the American Mathematical Society},
     pages = {553--564},
     publisher = {mathdoc},
     volume = {02},
     number = {3},
     year = {1989},
     doi = {10.1090/S0894-0347-1989-0986825-6},
     url = {http://geodesic.mathdoc.fr/articles/10.1090/S0894-0347-1989-0986825-6/}
}