@article{MOMA_1983__95_178123,
     author = {Imre Z. Ruzsa and G\'abor J. Sz\'ekely},
     title = {Convolution {Quotients} of {Nonnegative} {Functions.}},
     journal = {Monatshefte f\"ur Mathematik},
     pages = {235--240},
     publisher = {mathdoc},
     volume = {95},
     year = {1983},
     zbl = {0509.43004},
     url = {http://geodesic.mathdoc.fr/item/MOMA_1983__95_178123/}
}