@article{MOMA_1992__113_4_178562,
     author = {G. Lewicki},
     title = {Bernstein's },
     journal = {Monatshefte f\"ur Mathematik},
     pages = {213--226},
     publisher = {mathdoc},
     volume = {113},
     number = {4},
     year = {1992},
     zbl = {0764.41033},
     url = {http://geodesic.mathdoc.fr/item/MOMA_1992__113_4_178562/}
}