@article{MASLO_2005__55_4_a6,
     author = {Walczak, Zbigniew},
     title = {Error estimates and the {Voronovskaja} theorem for modified {Sz\'asz-Mirakyan} operators},
     journal = {Mathematica slovaca},
     pages = {465--476},
     publisher = {mathdoc},
     volume = {55},
     number = {4},
     year = {2005},
     mrnumber = {2181784},
     zbl = {1108.41015},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/MASLO_2005__55_4_a6/}
}