@article{IM2_1991_36_3_a9,
     author = {V. D. Stepanov},
     title = {Two-weighted estimates of {Riemann--Liouville} integrals},
     journal = {Izvestiya. Mathematics },
     pages = {669--681},
     publisher = {mathdoc},
     volume = {36},
     number = {3},
     year = {1991},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/IM2_1991_36_3_a9/}
}