@article{10_4153_CJM_1979_027_2,
     author = {Ditzian, Z.},
     title = {On {Global} {Inverse} {Theorems} of {Sz\'asz} and {Baskakov} {Operators}},
     journal = {Canadian journal of mathematics},
     pages = {255--263},
     year = {1979},
     volume = {31},
     number = {2},
     doi = {10.4153/CJM-1979-027-2},
     url = {http://geodesic.mathdoc.fr/articles/10.4153/CJM-1979-027-2/}
}