@article{PORMA_1983__42_3_115539,
     author = {Silva, M.R. da},
     title = {Nonnegative order iterates of {Bernstein} polynomials and their limiting semigroup},
     journal = {Portugaliae mathematica},
     pages = {225--248},
     publisher = {mathdoc},
     volume = {42},
     number = {3},
     year = {1983},
     mrnumber = {0819903},
     zbl = {0562.41007},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/PORMA_1983__42_3_115539/}
}