@article{PMF_1937_44_1_a18,
     author = {Landau, Edmund},
     title = {\"Uber mehrfach monotone {Folgen}},
     journal = {Prace Matematyczno-Fizyczne},
     pages = {337--351},
     publisher = {mathdoc},
     volume = {44},
     number = {1},
     year = {1937},
     language = {de},
     url = {http://geodesic.mathdoc.fr/item/PMF_1937_44_1_a18/}
}