@article{10_4064_sm_2_1_197_206,
     author = {Z. Birnbaum and W. Orlicz},
     title = {\"Uber {Approximation} im {Mittel}},
     journal = {Studia Mathematica},
     pages = {197--206},
     publisher = {mathdoc},
     volume = {2},
     number = {1},
     year = {1930},
     doi = {10.4064/sm-2-1-197-206},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/sm-2-1-197-206/}
}