@article{10_4064_sm155_2_3,
     author = {Tomoko Hachiro and Takateru Okayasu},
     title = {Some theorems of {Korovkin} type},
     journal = {Studia Mathematica},
     pages = {131--143},
     publisher = {mathdoc},
     volume = {155},
     number = {2},
     year = {2003},
     doi = {10.4064/sm155-2-3},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/sm155-2-3/}
}