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@article{MZ_1970__116_171380, author = {John Steinig}, title = {The {Changes} of {Sign} of {Fractional} {Integrals.}}, journal = {Mathematische Zeitschrift}, pages = {183--190}, publisher = {mathdoc}, volume = {116}, year = {1970}, zbl = {0188.18501}, url = {http://geodesic.mathdoc.fr/item/MZ_1970__116_171380/} }
John Steinig. The Changes of Sign of Fractional Integrals.. Mathematische Zeitschrift, Tome 116 (1970), pp. 183-190. http://geodesic.mathdoc.fr/item/MZ_1970__116_171380/