@article{10_1090_S0894_0347_05_00508_4,
     author = {Ionescu, Alexandru and Wainger, Stephen},
     title = {\ensuremath{\mathit{L}}^{\ensuremath{\mathit{p}}} boundedness of discrete singular {Radon} transforms},
     journal = {Journal of the American Mathematical Society},
     pages = {357--383},
     year = {2006},
     volume = {19},
     number = {2},
     doi = {10.1090/S0894-0347-05-00508-4},
     url = {http://geodesic.mathdoc.fr/articles/10.1090/S0894-0347-05-00508-4/}
}