@article{NUMA_1961__3_131471,
     author = {F. W. SCH\"AFKE},
     title = {Ein {Verfahren} zur {Berechnung} des charakteristischen {Exponenten} der {Mathieuschen} {Differentialgleichung.} {I.}},
     journal = {Numerische Mathematik},
     pages = {30--38},
     publisher = {mathdoc},
     volume = {3},
     year = {1961},
     zbl = {0100.08301},
     url = {http://geodesic.mathdoc.fr/item/NUMA_1961__3_131471/}
}