@article{10_4064_sm_16_2_124_129,
     author = {J. Kurzweil},
     title = {On approximation in real {Banach} spaces by analytic operations},
     journal = {Studia Mathematica},
     pages = {124--129},
     publisher = {mathdoc},
     volume = {16},
     number = {2},
     year = {1957},
     doi = {10.4064/sm-16-2-124-129},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/sm-16-2-124-129/}
}