@article{GDZPPN002407086, title = {The Changes of Sign of Fractional Integrals.}, journal = {Mathematische Zeitschrift}, volume = {114}, year = {1970}, pages = {183-190}, zbl = {0188.18501}, url = {http://dml.mathdoc.fr/item/GDZPPN002407086} }
Steinig, John. The Changes of Sign of Fractional Integrals.. Mathematische Zeitschrift, Tome 114 (1970) pp. 183-190. http://gdmltest.u-ga.fr/item/GDZPPN002407086/