@article{EJDE_2007__2007__a199,
     author = {Zhang,  Fuxing and Li,  Ya},
     title = {Almost periodic solutions for higher-order {Hopfield} neural networks without bounded activation functions},
     journal = {Electronic journal of differential equations},
     year = {2007},
     volume = {2007},
     zbl = {1138.34346},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/EJDE_2007__2007__a199/}
}