@article{EJDE_2009__2009__a48,
     author = {Walcher,  Sebastian and Zanders,  Christian},
     title = {Strong monotonicity for analytic ordinary differential equations},
     journal = {Electronic journal of differential equations},
     year = {2009},
     volume = {2009},
     zbl = {1375.34054},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/EJDE_2009__2009__a48/}
}