@article{EJDE_2002__2002__a5,
     author = {Wu,  Derchyi},
     title = {A global factorization theorem for the {ZS-AKNS} system},
     journal = {Electronic journal of differential equations},
     year = {2002},
     volume = {2002},
     zbl = {1068.37504},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/EJDE_2002__2002__a5/}
}