@article{MZ_1970__115_171358,
     author = {Kurt Kreith},
     title = {A {Comparison} {Theorem} for n-th {Order} {Differential} {Equations.}},
     journal = {Mathematische Zeitschrift},
     pages = {357--358},
     publisher = {mathdoc},
     volume = {115},
     year = {1970},
     zbl = {0188.39801},
     url = {http://geodesic.mathdoc.fr/item/MZ_1970__115_171358/}
}