@article{MZ_1968__104_170934,
     author = {Wolfgang Beekmann},
     title = {Perfekte {Integralverfahren.}},
     journal = {Mathematische Zeitschrift},
     pages = {99--105},
     publisher = {mathdoc},
     volume = {104},
     year = {1968},
     language = {de},
     url = {http://geodesic.mathdoc.fr/item/MZ_1968__104_170934/}
}