@article{ARM_1967__3_1_a1,
     author = {Karim, Rahmi Ibrahim Ibrahim Abdel},
     title = {\"Uber den {Resonanzfall} bei gew\"ohnlichen linearen {Differentialgleichungen} $n$-ter {Ordnung} mit periodischen ver\"anderlichen {Koeffizienten}},
     journal = {Archivum mathematicum},
     pages = {11--30},
     publisher = {mathdoc},
     volume = {03},
     number = {1},
     year = {1967},
     mrnumber = {0222387},
     zbl = {0231.34012},
     language = {ge},
     url = {http://geodesic.mathdoc.fr/item/ARM_1967__3_1_a1/}
}