@article{10_4153_S0008439520000612,
     author = {Debernardi, Alberto and Liflyand, Elijah},
     title = {Approximation via {Hausdorff} operators},
     journal = {Canadian mathematical bulletin},
     pages = {512--529},
     year = {2021},
     volume = {64},
     number = {3},
     doi = {10.4153/S0008439520000612},
     url = {http://geodesic.mathdoc.fr/articles/10.4153/S0008439520000612/}
}