@article{10_4064_sm_25_2_251_263,
     author = {G. Freud and S. Knapowski},
     title = {On linear processes of approximation {(II)}},
     journal = {Studia Mathematica},
     pages = {251--263},
     publisher = {mathdoc},
     volume = {25},
     number = {2},
     year = {1964},
     doi = {10.4064/sm-25-2-251-263},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/sm-25-2-251-263/}
}