@article{NUMA_1962__4_131515,
     author = {F.W. Sch\"afke and H. GROH},
     title = {Zur {Berechnung} der {Eigenwerte} der {Mathieuschen} {Differentialgleichung.}},
     journal = {Numerische Mathematik},
     pages = {64--67},
     publisher = {mathdoc},
     volume = {4},
     year = {1962},
     zbl = {0111.28103},
     url = {http://geodesic.mathdoc.fr/item/NUMA_1962__4_131515/}
}