@article{SIGMA_2006_2_a77,
     author = {Anjan Kundu},
     title = {Integrable {Hierarchy} of {Higher} {Nonlinear} {Schr\"odinger} {Type} {Equations}},
     journal = {Symmetry, integrability and geometry: methods and applications},
     year = {2006},
     volume = {2},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/SIGMA_2006_2_a77/}
}