@article{10_4064_sm_33_2_173_174,
     author = {Lothar Berg},
     title = {Zum {Problem} der {Operatorfunktionen} mit verschwindender {Ableitung}},
     journal = {Studia Mathematica},
     pages = {173--174},
     publisher = {mathdoc},
     volume = {33},
     number = {2},
     year = {1969},
     doi = {10.4064/sm-33-2-173-174},
     language = {de},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/sm-33-2-173-174/}
}