@article{NUMA_1969__13_131919,
     author = {K.P. HADELER},
     title = {Einige {Anwendungen} mehrparametriger {Eigenwertaufgaben.}},
     journal = {Numerische Mathematik},
     pages = {285--292},
     year = {1969},
     volume = {13},
     zbl = {0182.21401},
     url = {http://geodesic.mathdoc.fr/item/NUMA_1969__13_131919/}
}