@article{AM2_1969__2_182353,
     author = {P.L. BUTZER and K. SCHERER},
     title = {On the {Fundamental} {Approximation} {Theorems} of {D.} {JACKSON,} {S.} {BERNSTEIN} and {Theorems} of {M.} {ZAMANSKY} and {S.} {B.} {STECKIN} {(Short} {Communication)}},
     journal = {Aequationes mathematicae},
     pages = {398--398},
     publisher = {mathdoc},
     volume = {2},
     year = {1969},
     url = {http://geodesic.mathdoc.fr/item/AM2_1969__2_182353/}
}