@article{MM2_1979__30_154672,
     author = {Steven G. Krantz},
     title = {Estimates for {Integral} {Kernelsof} mixed {Type,} {Fractional} {Integration} {Operators,} and {Optimal} {Estimates} for the ... {Operator.}},
     journal = {Manuscripta mathematica},
     pages = {21--52},
     publisher = {mathdoc},
     volume = {30},
     year = {1979},
     zbl = {0417.35057},
     url = {http://geodesic.mathdoc.fr/item/MM2_1979__30_154672/}
}