@article{AMI_2004_31_a13,
     author = {J. H. Caltenco and J. L\'opez Bonilla and M. A. Acevedo},
     title = {A comment on the {Darboux} transformation},
     journal = {Annales mathematicae et informaticae},
     pages = {121--123},
     publisher = {mathdoc},
     volume = {31},
     year = {2004},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/AMI_2004_31_a13/}
}