@article{PIM_1988_N_S_43_57_a6,
     author = {Milutin Obradovi\'c and Shigeyoshi Owa},
     title = {A {Note} on {Certain} {Class} {Defined} by {Ruscheweyh} {Derivatives}},
     journal = {Publications de l'Institut Math\'ematique},
     pages = {59 - 63},
     publisher = {mathdoc},
     volume = {(N.S.) 43},
     number = {57},
     year = {1988},
     url = {https://geodesic-test.mathdoc.fr/item/PIM_1988_N_S_43_57_a6/}
}