@article{01184308, title = {Discrete analogues of singular and maximal Radon transforms.}, journal = {Documenta Mathematica}, year = {1998}, pages = {743-753}, zbl = {0971.44003}, language = {en}, url = {http://dml.mathdoc.fr/item/01184308} }
Wainger, Stephen. Discrete analogues of singular and maximal Radon transforms.. Documenta Mathematica, (1998), pp. 743-753. http://gdmltest.u-ga.fr/item/01184308/