@article{EJDE_2010__2010__a96,
     author = {Li,  Tongxing},
     title = {Comparison theorems for second-order neutral differential equations of mixed type},
     journal = {Electronic journal of differential equations},
     year = {2010},
     volume = {2010},
     zbl = {1208.34110},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/EJDE_2010__2010__a96/}
}