@article{ARM_1970__6_4_a5,
     author = {Karim, Rahmi Ibrahim Ibrahim Abdel},
     title = {On the behaviour of the solutions and their first $(n-1)$ derivatives of the $n$-th order differential equations with periodic coefficients},
     journal = {Archivum mathematicum},
     pages = {237--249},
     publisher = {mathdoc},
     volume = {06},
     number = {4},
     year = {1970},
     mrnumber = {0298129},
     zbl = {0233.34039},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/ARM_1970__6_4_a5/}
}