@article{PA_2020_9_3_a9,
     author = {S. L. Wali},
     title = {An integral estimate for an operator preserving inequalities between polynomials},
     journal = {Problemy analiza},
     pages = {137--147},
     publisher = {mathdoc},
     volume = {9},
     number = {3},
     year = {2020},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/PA_2020_9_3_a9/}
}