@article{NUMA_1979__32_132591,
     author = {E. Wagenf\"uhrer and H. Lang},
     title = {Berechnung des charakteristischen {Exponenten} der endlichen {Hillschen} {Differentialgleichung} durch {Numerische} {Integration.}},
     journal = {Numerische Mathematik},
     pages = {31--50},
     publisher = {mathdoc},
     volume = {32},
     year = {1979},
     zbl = {0431.65058},
     url = {http://geodesic.mathdoc.fr/item/NUMA_1979__32_132591/}
}